Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a26367c87b4d0c8…

MALICIOUS

PDF

76.8 KB Created: 2021-06-08 08:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5712ae48f4266d13a26339de2c00fa3f SHA-1: b7ae5d3533d9bdb7c4cf6843793fbe7bbe0198f6 SHA-256: 9a26367c87b4d0c83fe429dc7e0796efcd893b54ad2674fd2ea7609dd47ac761
186 Risk Score

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 0.9996

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/123?utm_term=mariam+khan+reporting+live+latest+twist PDF link annotation
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/02cd60744004.pdfIn PDF document text
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/1fe5a5c4b.pdfIn PDF document text
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/09ee220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5fc7ba837cb8c.pdfIn PDF document text
    • https://tevipane.weebly.com/uploads/1/3/2/6/132681072/8444408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_60351eb5b19d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413457/normal_6059ce08afcd6.pdfIn PDF document text
    • https://towoxaji.weebly.com/uploads/1/3/0/7/130740158/7527857.pdfIn PDF document text
    • https://bufezemaz.weebly.com/uploads/1/3/4/7/134714495/6361349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463272/normal_60b85e0bf1aab.pdfIn PDF document text
    • https://jujoxetanilodav.weebly.com/uploads/1/3/5/3/135397559/fesan-rixizanegobemiw-kebedaroxinel-guxabibisab.pdfIn PDF document text
    • https://robubafo.weebly.com/uploads/1/3/4/5/134588337/5871023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366364/normal_6002672eecd6b.pdfIn PDF document text
    • https://togoritireso.weebly.com/uploads/1/3/4/6/134619717/nirosawe-wesiriripiwume-kujafeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8b105a-164f-4cb3-aeb4-62e14c6013c6/vigulalarogadevib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e49fdbc-7170-4440-9b26-779675b66511/46153416875.pdfIn PDF document text
    • http://laxaxufudej.pbworks.com/f/65267770247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d268161-ec29-4878-828a-b23d67a9693a/zovazafamovulit.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144489180/pattern_block_puzzles_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4661f0e8-85fa-46e6-b49f-34ce6ee20660/64690772494.pdfIn PDF document text
    • http://vedufid.pbworks.com/w/file/fetch/144510714/hcf_and_lcm_questions_for_ssc_cgl.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010c3c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C3C 16836 bytes
SHA-256: 9b4806a32900c53311f5f3308a3faafe5c2da1fecbcef5977b766443502947c2
font_00_sfnt_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 5452 bytes
SHA-256: fcee2ad9587fa0aac8072a88af9db7cdc8281d1744984bdc93e9590d24af8c8c
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 10276 bytes
SHA-256: 6aed07573bf122350e37bf1eb4c86111b59c9d9c6f6f5f7c26c76d9dbc5a435f