Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1f335eb0dca37b…

MALICIOUS

PDF

68.4 KB Created: 2020-12-22 12:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7a7dc64a8bb54db402412b448205c03e SHA-1: 790b4c5ba64ac2fdaea0ab0fe66647a9c46d884f SHA-256: 8a1f335eb0dca37baaf7232c0e4cfe878495b84dfaebe852ec0c70c44ac02498
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, which is characteristic of SEO link farms. One of the embedded URLs, 'https://trafficel.ru/123?utm_term=public+relations+proposal+examples', is suspicious and likely part of a phishing or malicious redirection scheme. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/123?utm_term=public+relations+proposal+examples PDF link annotation
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/addd2c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_5fbd9c80a35d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470552/normal_5fd940955ddeb.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/maruduge_sinogunopani_wagusuxiluzugiw.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/jolunenafobuw/74908651532.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde7c6a297e1070131a54d5/t/5fdead63e64f5703152fbd4e/1608428900698/rorofatozalox.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/h2o2_h2o_o2_oxidation_number.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/vukaweredazadupabisis.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/nokaxazepudavunized.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef025866-5c3f-40e3-a392-c77b7a168fa3/skyrim_mods_argonian_armor.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/bitdefender_free_windows_7_64_bit.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4d5a48139af03765e4d31/t/5fc5be03cb3e0f577116baa3/1606794756229/audi_s4_avant_for_sale_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48fc4e85-916f-41f1-ab36-6aec4e1abda2/56097249685.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/spotify_premium_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/81881226060.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/aladdin_cartoon_ringtone_free.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_off0000cf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0A 5288 bytes
SHA-256: 882db55c58e96dd15e1b26b60a365d56119cfe58c8b824eeebf3ee261cbe6e64
font_01_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 10544 bytes
SHA-256: 82e1f4a377bc7c10af42a4d1d2089b45fd26d55187cc7e5c78014f78f42ec03b

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