Malicious PDF — malware analysis report

Static analysis result for SHA-256 576d352c6b463377…

MALICIOUS

PDF

96.7 KB Created: 2021-04-04 18:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e4dc1a9b410fa4ce376f459ba2e2af35 SHA-1: eb741f1fba17f0740ce078d2fe9301b89d9c38ea SHA-256: 576d352c6b463377e5e05064896f1fccb71b88b22ca1195fa31f0b82913d8fb6
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 0.9998

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://soxebez.ru/strik?utm_term=the+reluctant+fundamentalist+quotes+chapter+2 PDF link annotation
    • http://policyhelpcenter.com/28824365201h5gbv.pdfIn PDF document text
    • https://virerulifig.weebly.com/uploads/1/3/1/4/131407283/840152.pdfIn PDF document text
    • http://meetsalle.xyz/how_to_read_better_and_faster_pricez4lkl.pdfIn PDF document text
    • http://xruhdfo.site/capteur_de_temperature_dallas_ds18b20yf8sa.pdfIn PDF document text
    • https://tixatodaja.weebly.com/uploads/1/3/4/5/134507568/814e068.pdfIn PDF document text
    • https://baseparefawufif.weebly.com/uploads/1/3/1/4/131453046/fesitopabatax.pdfIn PDF document text
    • http://dabosesavedevet.medianewsonline.com/62413773737.pdfIn PDF document text
    • https://xevujudibibabus.weebly.com/uploads/1/3/4/5/134599482/fakoruk.pdfIn PDF document text
    • https://jigurojo.weebly.com/uploads/1/3/5/3/135321607/4820638.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/advanced_excel_tutorial_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/54129642745.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/43923759438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0992788b-71a9-424c-8d78-4b2cf81978bb/lean_manufacturing_principles_5s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f83f7e-f4fe-4a9b-93d7-3a8ddc672e97/27771881703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9182fb8-c506-42d6-925b-629f925b3b2a/what_is_structured_system_analysis_and_design.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/sakut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/859fa088-7ebe-49b8-aaca-2a64f8e6b009/what_are_the_words_to_you_are_my_sunshine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72c1916-ff8e-4122-8222-d17d372111a0/8512854184.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/fovojije.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_off00012fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FED 5604 bytes
SHA-256: 626dd16b132e9f5c0f4fda6af85572170b2216d32c2024525c4698c4c46dab5a
font_01_sfnt_off000142cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CF 15768 bytes
SHA-256: b0518859a7d0ced9b04f93848448b6a109bf9dfbbe1f8589ad5d49b764b5049d

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