Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2560dbbecdb47fb…

MALICIOUS

PDF

79.4 KB Created: 2021-04-05 13:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dafdb85935ede709bf702469aeeee431 SHA-1: 763d142a15851f676fefc2ac9d9b8fd83d31f420 SHA-256: d2560dbbecdb47fbbaf005e69ed4ba45866a68e93f525a997ccb457f8033ce77
176 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. It uses a callback-phone (TOAD) lure. 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://midufefew.ru/strik?utm_term=gas+safety+insurance+reviews PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415745/normal_5fee93055060d.pdfIn PDF document text
    • http://tdsevsvet.ru/names_of_harry_potter_movies_from_first_to_lastu0gb1.pdfIn PDF document text
    • http://stepka2016.xyz/how_to_pass_the_written_driving_test_in_arizona7mrev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480895/normal_60332c4d888e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_606833af43072.pdfIn PDF document text
    • http://hayatevesigar.online/how_to_draw_scary_monsters_easy2kru6.pdfIn PDF document text
    • http://voirlo.xyz/wonajisomopapiraxk44p7.pdfIn PDF document text
    • http://sethel.xyz/6737020202206lup.pdfIn PDF document text
    • http://ita-fitness.fun/zevudiju6q2h2.pdfIn PDF document text
    • http://healthit.space/dedojowipijobebilejadezewlt6is.pdfIn PDF document text
    • http://trikotoria.ru/pexatebabukezelowg3ci.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nefunupu/zemewizumidaxodifezogexo.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/tabopiwunufebetawoj.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_3ba58f0538e34ad6bf70e90b3508f62f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pubopelej/23782080142.pdfIn PDF document text
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_070393c36bbc4090a5a3844135d30a94.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/ms_word_for_mac_2011_updates.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/battle_house_full_movie_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/puwot.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 5128 bytes
SHA-256: 1428ad4c6d563c3744918fdf3d2866a797902094593ba69bf4020210970d097c
font_01_sfnt_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 10468 bytes
SHA-256: 46c8b855d4dab841e567d7918d252b3cfdf2c787c225e9166b77de5b36fa85e1
font_02_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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