Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2e4b2a603b032a…

MALICIOUS

PDF

75.7 KB Created: 2021-04-14 17:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b43df34d04070e291593d655a4d55dcc SHA-1: bb4d0e9dee28609e971eae96bed4dab183b3da68 SHA-256: db2e4b2a603b032acb6bf05d8865b0055423cdcd73b62222a211aaf5556fabcc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://vilenefex.ru/strik?utm_term=words+their+way+spelling+stages PDF link annotation
    • http://dizewut.22web.org/organizational_chart_template_powerpoint_2007.pdfIn PDF document text
    • http://suzamakulamuj.mypressonline.com/14715104443.pdfIn PDF document text
    • https://mosazipabefo.weebly.com/uploads/1/3/4/7/134735261/wokif.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/deeed.pdfIn PDF document text
    • https://susejovidexoxi.weebly.com/uploads/1/3/0/7/130775922/a7748c9.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/pepebulalumosi-dimavadutamimas-larini-bixitikusabori.pdfIn PDF document text
    • https://veduwasa.weebly.com/uploads/1/3/1/6/131637496/galizagagezos_famase.pdfIn PDF document text
    • https://litalegikuga.weebly.com/uploads/1/3/4/5/134587653/8941860.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/51b7ae6b688a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_d67d1bd432e341be99c9c2fc09352fdf.pdf?index=trueIn PDF document text
    • http://marurutefa.atwebpages.com/situpafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4097a9-e5b4-4b8f-bd32-2f088607b8e4/husqvarna_lawn_mower_hu775h_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a610e458-a92f-404c-b501-bb5212bd8875/how_does_a_killswitch_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1059579c-bf03-4ed9-8f7c-bf122b1bc0e3/zadef.pdfIn PDF document text
    • http://wulimazef.epizy.com/vovepabotekolaminid.pdfIn PDF document text
    • http://juromozupipoju.rf.gd/how_to_setup_netflix_on_my_sony_blu_ray_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2afc567e-fa81-4220-bee3-556213b2ee8c/61356916263.pdfIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_6e7d20b41ae449de99527c80b995283b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa78a5b-5fe8-4385-a02b-6a7356b92c18/91880519667.pdfIn PDF document text
    • http://tisilakifejil.rf.gd/vampire_diaries_season_8_episode_16_summary.pdfIn PDF document text
    • http://lobaman.epizy.com/jewekuku.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 5428 bytes
SHA-256: ff3be59fb48fd2e5818743e52f89fd9f555694b8890542982a8a5e963b5a0703
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 10556 bytes
SHA-256: 79f5ce5206bb2b935848bc1381ec2b8bdbca29e9e66b70dceb0b79d351a29737

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