Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5f7142569c6150…

MALICIOUS

PDF

84.0 KB Created: 2021-03-18 14:35:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3798cf674f8b37aacb8e3f9f89238f5b SHA-1: 690df6fc21265692f1375eb7785f62514e1f77d3 SHA-256: fc5f7142569c61509c9679bf919621ec85a201e493d916376404c08ee768e20e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous external links to other PDF files, likely to deceive users into downloading them under the guise of free resources. The presence of embedded URLs and the link farm structure strongly suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/award?keyword=encyclopedia+dictionary+pdf+free+download PDF link annotation
    • http://zezasarasojid.mywebcommunity.org/asynchronous_data_transfer_in_computer_architecture.pdfIn PDF document text
    • https://kilobabax.weebly.com/uploads/1/3/1/8/131856311/9736925.pdfIn PDF document text
    • http://tibagisuminove.sportsontheweb.net/math_olympiad_word_problems.pdfIn PDF document text
    • https://juxagoneponux.weebly.com/uploads/1/3/1/3/131384300/ea98d9b.pdfIn PDF document text
    • https://wegotogad.weebly.com/uploads/1/3/4/3/134342574/dijimoserego.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/bunaninitog.pdfIn PDF document text
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/3319519.pdfIn PDF document text
    • https://baponejivo.weebly.com/uploads/1/3/5/9/135986917/2158284.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_92add62aae964d788ecd9b8b195881f8.pdf?index=trueIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_34145060e0b140c499b0977d29671161.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_48e9a0174d5a4b9e82d19d37b1062117.pdf?index=trueIn PDF document text
    • http://xenezipulugiji.atwebpages.com/zalebajomazizarotiful.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/43115510134.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_c6723449c54f44318b74cec01ac0d10d.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_ca6fe86ae1e2495290d11c4efafe693d.pdf?index=trueIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_146c9dcd90ca4e2ebf90b2ab36d005be.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_ca4963e0b0f242ebb185ca3d35bdc96e.pdf?index=trueIn PDF document text
    • http://xipanizi.myartsonline.com/discuss_the_bantu_migration.pdfIn PDF document text
    • http://nitubak.atwebpages.com/american_english_pronunciation_dictionary.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_a91a83972d7b4cca8d75d91db9475c89.pdf?index=trueIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_6a8fdeb0d2c24ca89aabfb7b13d383d6.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 3852 bytes
SHA-256: c13bca5eeaee39758f0e365aa7a5830a9a70305beebc6755f449094dbb633c3f
font_01_sfnt_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 4908 bytes
SHA-256: 58329ebe497bbce62fea629e7dd0f10fbae07f4d4633b16924315d108f7994f7
font_02_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 10800 bytes
SHA-256: e5598662e7c368fc8625b590843a8e96f989f40936a1928d0efd7a0b900073f2
font_03_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 16344 bytes
SHA-256: ed45a24507f18daeaf6b6e9cac20235e9e43bed88bc2d44b7621eff085e31190
font_04_sfnt_off000133b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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