Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c144d871aa0270…

MALICIOUS

PDF

68.0 KB Created: 2020-11-20 11:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8eb9083505fc0a526caf44d10d7b625e SHA-1: 1998f91297f2ddc43dcb56d44e286f56dcccee55 SHA-256: 66c144d871aa02709a541aa63e907954e202aa904619561bfac009d9364b53af
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, with URLs like 'https://trafficel.ru/123?utm_term=city+mini+zip+manual' being prominent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=city+mini+zip+manual
    • https://zaxanedipujez.weebly.com/uploads/1/3/4/5/134582154/zizipawakelifote.pdf
    • https://meritogaxubov.weebly.com/uploads/1/3/4/7/134767100/zugadi.pdf
    • https://fitijozis.weebly.com/uploads/1/3/4/3/134372299/jagedasepofi.pdf
    • https://zutafemaz.weebly.com/uploads/1/3/4/4/134478566/piwilen.pdf
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/bf98c810a3f7cb0.pdf
    • https://subonotewus.weebly.com/uploads/1/3/4/3/134347286/017a819a.pdf
    • https://lidikizibapusak.weebly.com/uploads/1/3/4/8/134883913/suwuj.pdf
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/871786.pdf
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/5081754.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4bfea320-3768-4182-9dd4-a73249c29b7c/61391825472.pdf
    • https://s3.amazonaws.com/sinadi/stat_22500_purdue.pdf
    • https://s3.amazonaws.com/bifamomove/craig_sound_bar_cht923_manual.pdf
    • https://uploads.strikinglycdn.com/files/0664789e-9096-49b1-95f3-017ed4b7d9b5/dunorifunajifot.pdf
    • https://uploads.strikinglycdn.com/files/f2d639c2-109c-4729-b5fc-d64ef293a20b/44466052840.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cadc.bin
89900253dc39e47355ea9206c177acec80b4215f7855353ad97046f942d91aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCADC 4748 bytes
font_01_sfnt_off0000dafe.bin
b6df5497396249059d6d1fbb694eb3bfb446765c2da3a31aba6fec08ff501d81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 12404 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.