Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecbd85e5668fc6f…

MALICIOUS

PDF

80.4 KB Created: 2021-04-05 21:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 133de27a4b584fc5e27b266d71e31bb0 SHA-1: 45d9bd17be5c2ed5a57561edc020304f50102e5b SHA-256: aecbd85e5668fc6f64fecd5189c8fdc1c18831aca394a5451bc7539ba1b7a11c
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=apartment+guide+indianapolis+northside PDF link annotation
    • http://rezltml.xyz/zadoposo0t8x.pdfIn PDF document text
    • http://vorgazme.com/mes_140_smoker_reviewsg565k.pdfIn PDF document text
    • http://erogan24.website/739840765660gv3s.pdfIn PDF document text
    • http://trenketo.buzz/what_are_paralegals_allowed_to_do_in_ontarionfm4g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_df1cbf6dd10d4acd827152c33e1f5454.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_f87917f0bac44d188ca2f27637b952f0.pdf?index=trueIn PDF document text
    • https://aaf2f8d8-4593-4070-95c3-ed2308805076.filesusr.com/ugd/337eea_f6d7104f3e0b47a1a4cd749bdc999447.pdf?index=trueIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_c7062c8301454f09923791a723c930ad.pdf?index=trueIn PDF document text
    • https://8717ace1-8174-44a1-9f98-e7cbf9e9ed94.filesusr.com/ugd/14e3be_33b44fc3383b4103aa479a0c726189c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba62112b-c89b-4afe-b156-fe3a2d1729a3/47713474027.pdfIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_7582df6f2ba842f8ba5d44c9e5c8b8f5.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_5377579aba3b4bbbad66d5de0090ab4d.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_4db117da7c474c499c2596b4c060e2c9.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_c6fee86f513c45b58a78c2e5a847af7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ad7ceb-62de-4b96-890a-31cdb93b09f4/pokekifinafezajimateg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c0003b-ea1d-45d7-ace0-0eb6bc2ddb70/movizagabizukibibib.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_b00a0c61ddfe48c4877cc12fc86ed01b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 5360 bytes
SHA-256: bcbfca39a4ac3b9cb3548cad0bf41260738771759ed5cbe75130ece278cf76bb
font_01_sfnt_off00010fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 10784 bytes
SHA-256: 99d27c4d29f28d829ff7cd59476b81826c91a3c7967355d2d1d061b11751caf9

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