Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b6bb868add1510…

MALICIOUS

PDF

70.2 KB Created: 2021-01-06 13:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1d217841a9d3a2fe224630b424af058b SHA-1: 9fe9e819802edd60d9570b281c35796fc9d2aa8d SHA-256: 38b6bb868add1510dc870ed4e691ca0c26a3b9eaa756cb36f8986f86440ef72b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://trafffi.ru/aws?utm_term=final+injury+report+eagles PDF link annotation
    • https://famipitep.weebly.com/uploads/1/3/4/3/134355151/volidotejenix.pdfIn PDF document text
    • https://dirotazu.weebly.com/uploads/1/3/1/0/131070105/3210593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_5fa93a0bf34ca.pdfIn PDF document text
    • https://dalegoronatodul.weebly.com/uploads/1/3/4/3/134309481/jemokogureren.pdfIn PDF document text
    • https://fegibaja.weebly.com/uploads/1/3/4/3/134305779/zekolilubepen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5ff2f2439fac4.pdfIn PDF document text
    • https://xagufiwukana.weebly.com/uploads/1/3/4/6/134694649/3992860.pdfIn PDF document text
    • https://nimifitirujaga.weebly.com/uploads/1/3/4/6/134693460/mikeratonadisixeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403130/normal_5f92339c20c29.pdfIn PDF document text
    • https://tumekisegazuf.weebly.com/uploads/1/3/4/6/134611428/volonib_xelafazuw.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/naduvilizelel_kanofifipe_xitumuva.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/ecb3aaf6-8ecf-4ea6-8edc-590383fdb986/pajela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a085ac64-c0b8-40c1-9248-224b638fc537/clash_of_clans_top_players_money_spent.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_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 5120 bytes
SHA-256: cc66bdd4cf8e5cc8467249bac87dfad1dfe50f38538185b25451ebbf5d83f804
font_01_sfnt_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 11520 bytes
SHA-256: e09b9451dfde5492c752dfe3d02bc88de58f510153590e0bf376d9c9f33f93e7

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