Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b776282771bf72…

MALICIOUS

PDF

72.2 KB Created: 2021-03-24 14:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 13b93df23ddeb62555a2237a32543878 SHA-1: 94fa42458915a99d6f16db7b92c17f9ee9ef50dd SHA-256: b5b776282771bf72540ae01190708abe86953958ff1420ec25403a8decde9847
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://seumenha.ru/wix?keyword=what+does+the+fox+say+free+download PDF link annotation
    • https://pareruli.weebly.com/uploads/1/3/4/8/134891857/zetinijilodogur.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/versace_chain_reaction_red_watchponlq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_604867bf63463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_603b7898e80d4.pdfIn PDF document text
    • http://abreudesigns.com/desudazipubibaruriboeymn4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_60585a48433d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477651/normal_6016b97f39d87.pdfIn PDF document text
    • https://jegetujo.weebly.com/uploads/1/3/5/3/135300600/a84047300919e.pdfIn PDF document text
    • https://vekiruwubutut.weebly.com/uploads/1/3/1/0/131070393/5279570.pdfIn PDF document text
    • https://rokelabik.weebly.com/uploads/1/3/0/8/130813827/notonuvulikuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_6016c256a4c09.pdfIn PDF document text
    • http://copyright-securityx.com/665228504807oe0u.pdfIn PDF document text
    • http://tradestaroffice.com/one_punch_man_season_1_studiooj87c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_6047a116ebde7.pdfIn PDF document text
    • http://it50save.info/how_long_do_american_standard_furnaces_lastbubyn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369330/normal_5fe0a67804d79.pdfIn PDF document text
    • http://bigtittybella.com/how_to_install_patches_sims_31cdz5.pdfIn PDF document text
    • http://ovca.space/best_websites_for_learning_english_grammar8brfm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376354/normal_6004987480d7a.pdfIn PDF document text
    • http://lozhobelir.space/bosquejos_biblicos_de_los_salmosm7xeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_601f9d5ae5484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_603b6132d0b97.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://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_725e61c53f164981a2feb7a161330110.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_437511fc17514c65809d3f3223cb940e.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_eed8067635d94766861c13b4f0eb3fea.pdf?index=trueIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_992928b1fe7d44d7839caef220e780e5.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 5008 bytes
SHA-256: 928d762c01f8154d5b14de88873a285ab2e7f091cbc5947686ae22b23ddaa851
font_01_sfnt_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 10252 bytes
SHA-256: 7e4b31cefb16785242bd3f1be8299f2b27fcd2317dba12f8a423481a0b874def
font_02_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e