Malicious PDF — malware analysis report

Static analysis result for SHA-256 17115e6727a2a9ad…

MALICIOUS

PDF

66.5 KB Created: 2020-12-29 16:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6fa37d867b3261d1e66131a8c109d3aa SHA-1: 3876fbffce07c01c1b5a8a3a949d99e647927356 SHA-256: 17115e6727a2a9ada335293065f75ed4904d9fa96c24d88b969be591b0c46d1f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were extracted, the structure and numerous external links are indicative of a malicious campaign, possibly a spearphishing attachment leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=vedas+in+english+amazon PDF link annotation
    • https://cdn.sqhk.co/bujavenizake/DOhigMQ/driver_ftdi_arduino_mega_2560.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409093/normal_5fe0aa67302f1.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/WSqocbz/basketball_champions_league_unblocked_games.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/c3ecfacdf1.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/jfNTTWu/zibabev.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/a3b294b1f8f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f96fe891631f.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/ergfifG/mosesevonidefo.pdfIn PDF document text
    • https://cdn.sqhk.co/mokavokaven/RKmlNSy/84776750716.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/iaQUljb/wallpapers_for_iphone_11_4k.pdfIn PDF document text
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/ninujuzegera_fopaj_bowoti.pdfIn PDF document text
    • https://cdn.sqhk.co/supuzeren/RYFhmU8/40603633643.pdfIn PDF document text
    • https://vofepelatuj.weebly.com/uploads/1/3/4/7/134768647/bapekoxugaxiju.pdfIn PDF document text
    • https://nifonafepo.weebly.com/uploads/1/3/5/3/135319448/4517181.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/1ea975ba-bc93-467a-ab59-1866c2085fba/zipiwuvonomoteg.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/audioslave_discography_320kbps.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_off0000ca16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA16 5160 bytes
SHA-256: 86eaf62692a9e4ced2288f0b777f72122206c61bef3981d13eb138998703e221
font_01_sfnt_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 9880 bytes
SHA-256: 3376a01f364fa8437912ab415a5f3c1a771ab019f946d727715ab6c6878bb558

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