Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d753033f619e24…

MALICIOUS

PDF

92.8 KB Created: 2020-11-23 10:13:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d7c7491fcafa633658be93589dc807ea SHA-1: b0cddb9a21d69e5a4c8ea5d4e16730685212a722 SHA-256: f5d753033f619e24fbc6504bedf94cb46bfc9b3a5342cac72d4db694d4f3a311
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this as malicious, specifically a phishing trojan. While no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=24+awg+wire+resistance PDF link annotation
    • https://gorugofinugiv.weebly.com/uploads/1/3/4/3/134334376/5a39b2cd8d8a98.pdfIn PDF document text
    • https://kuxilididid.weebly.com/uploads/1/3/4/3/134387830/muregis_kovape_nixutiviwowi.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/rabojujib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_5fa595c082e79.pdfIn PDF document text
    • https://gazitagoro.weebly.com/uploads/1/3/4/0/134016873/5fa8dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493873/normal_5fba1d21cbf98.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/porikujeluzad-pojuzogiz.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/90d79005-7213-41d1-9b36-b4a2635bcaba/zizafefumula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa2878e-b915-47f0-85c5-f2128564cd9a/leed_bd_c_reference_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/tukuz.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/happy_birthday_punjabi_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4724c7f0-ae47-42b3-b453-636f96839fec/lagopumukitemokonovepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f71e0de-7188-4f46-a7e9-224f8ddb1791/81227767539.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_005_off00013e5f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13E5F 22976 bytes
SHA-256: 77123336fdf259de16e6596a6b75bcb8016341035c45d370507023ce587f95aa
font_00_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 5152 bytes
SHA-256: 8a42ed6e10c1dbdc3baf79c1d71c35a146194acec185e6ab79644ec0f07ecc8b
font_01_sfnt_off000113e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 12408 bytes
SHA-256: f18f3a28e1df78c29f9534a167e5cbac6eb02f908a745443b7160c3d9d130039

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