Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace9df8c5cc52e3e…

MALICIOUS

PDF

85.4 KB Created: 2021-02-12 01:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d7b04202816fed37fd5c92dfb46dcb8a SHA-1: 33e9119db3a3b8876601480bf6c43b25cb26bd7e SHA-256: ace9df8c5cc52e3eb3eb8ca42ec987fd9aac1dbfea5078d9fa460af5db03e0fa
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'google sites login', aligning with phishing or credential harvesting tactics. No scripts were extracted, but the presence of external URIs and the nature of the heuristics point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=my+google+sites+login PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391331/normal_5fea301cb1b0b.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/b938c.pdfIn PDF document text
    • http://creamwalls.space/fonirofoxosamekorurdwpna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458824/normal_5ff88400d30f8.pdfIn PDF document text
    • http://my-favshop.online/60869381349jg8mp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377115/normal_5ff678e2a6ab5.pdfIn PDF document text
    • https://kejojotevunujip.weebly.com/uploads/1/3/1/8/131871587/punogojigalozif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415326/normal_6008ddbe28dd6.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/8128775.pdfIn PDF document text
    • https://guvufusefek.weebly.com/uploads/1/3/1/0/131070011/2100964.pdfIn PDF document text
    • http://togoxuruk.22web.org/forma_1_kanadai_nagydj_2019_futam_kzvetts.pdfIn PDF document text
    • https://nonedavoxezi.weebly.com/uploads/1/3/5/9/135956696/006cab.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/poguvelefa/486660504.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_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 4656 bytes
SHA-256: 2158ca4666e61965a5fe2e71cbe0bf43165da9eaf2f423d372ea967189da4bc1
font_01_sfnt_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 15568 bytes
SHA-256: 6b44b3e5deb48ccaba9a30bf12c4e13deb3a1d3d4fe6b2e8758a8efadda518b3

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