Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6776463e9664ab…

MALICIOUS

PDF

84.6 KB Created: 2021-05-25 01:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 39489842f250c18e5aec6b4c2725ddef SHA-1: 47be339064c8c5a9534226875e4b2644484b0c69 SHA-256: fc6776463e9664abb00f7117fd483f48095386b8fecc1267334f14b83d5105d7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary URL pointing to a suspicious domain associated with a link farm. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=super+smash+flash+2+beta+unblocked+mcleodgaming PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458616/normal_60035e64adcc7.pdfIn PDF document text
    • https://verefatodefi.weebly.com/uploads/1/3/4/7/134722939/lebagazasab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414869/normal_5fecd4f4eaa55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_604dc2165be51.pdfIn PDF document text
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/rewufevoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_60321ae1a33e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_603541ff629b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_602e7970bc7d4.pdfIn PDF document text
    • https://verukutuxa.weebly.com/uploads/1/3/5/3/135330203/ludojapikus-dixuwenigozod-rakinog-jilewifagosilo.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/4175494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_6011de061a1e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_602cabfdef0e5.pdfIn PDF document text
    • https://kigukudisan.weebly.com/uploads/1/3/5/3/135321724/7135130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_6041c8b59714f.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/nowokil/32040882783.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/12987024072.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/19652617822.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_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 6008 bytes
SHA-256: 20abcc8c84caaad7507ca4c0078e6b10aec9a1c7e270d5f9b2e6adf4660ebae1
font_01_sfnt_off00011e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 12248 bytes
SHA-256: df9b416beeb8707a10a6a3cfbc3d2b44ac3e0bc35828c4b76bc7d975a43290b6

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