Malicious PDF — malware analysis report

Static analysis result for SHA-256 95aeeb4d18859dd4…

MALICIOUS

PDF

79.0 KB Created: 2021-05-13 09:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 636e0e4ca52cda686be72264c5b17e6d SHA-1: 68370e82d16842789803323bdcb71920c0333c98 SHA-256: 95aeeb4d18859dd477d20a47ba57715b994a2c7e7bbfbba5bedf696a84282931
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of external URIs and a link farm heuristic strongly suggests the document's primary purpose is to drive traffic to external sites, likely for phishing or malware delivery.

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://druttle.ru/strik?utm_term=what+do+internal+combustion+engines+run+on PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445341/normal_601b8cc2a4f01.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/nDNAutW/8939132331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500001/normal_5fe5a454c1385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_60558ae69c024.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/how_to_use_bissell_spotlifter_powerbrush.pdfIn PDF document text
    • http://nokilibetajew.mywebcommunity.org/77614828119.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/shflNre/meme_soundboard_ultimate_2020_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/ajcgfih/63721974413.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/7251373076vljbk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409095/normal_600929903d134.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/jhciekY/funny_chicken_wallpaper_for_android_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_6048c5e03259c.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/UijvFgr/find_friends_iphone_and_android.pdfIn PDF document text
    • http://ipoteka.net/top_100_movies_imdb_english21z62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bigapenegig.atwebpages.com/josagalurabu.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_c794786759a04482a8357c799e3b7081.pdf?index=trueIn PDF document text
    • http://sawuliwinupunud.epizy.com/10553672540.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_0a3fab49524d4a8b959c0920097b28d1.pdf?index=trueIn PDF document text
    • http://wagupamodesugub.rf.gd/both_and_either_or_neither_nor.pdfIn PDF document text
    • http://vavinarel.rf.gd/61752000809.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_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 5508 bytes
SHA-256: fa31a2e30f70bc18a71847a5d3338b7f649446c5f56705862a147b7c5bc3aff3
font_01_sfnt_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 11308 bytes
SHA-256: e71aa2aef69683025e997498a0a44ee389d9feb493499ee4ba2c00611f7a18af