Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdda2686ecf2c15c…

MALICIOUS

PDF

118.8 KB Created: 2021-05-22 11:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d2a3c5c631b4b7c7e5007420ad66824b SHA-1: 20655acde43f37644893951d7d9b1ff4f5bed5cd SHA-256: fdda2686ecf2c15ce91d5aa40fd5ef0a3d5e6a95bdcbdd463021e66f6b542208
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/strik?utm_term=good+way+to+start+a+conversation+online+dating PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482018/normal_60097b1207261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_601b229c01f5b.pdfIn PDF document text
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/vulaguleraxelumepike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421051/normal_606e7e9dc215e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_6043e6934e9af.pdfIn PDF document text
    • https://sajolunuweto.weebly.com/uploads/1/3/1/4/131407571/488db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_602de90421c6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_5fd76aef6bca0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_6068749b5699d.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/banosujogixeso_wuluxigisovomo_lajifowogaret_fudaxowo.pdfIn PDF document text
    • https://zuwogirunuwexi.weebly.com/uploads/1/3/5/3/135331524/32c290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_6064d1a2d45d4.pdfIn PDF document text
    • https://zedimidobigeno.weebly.com/uploads/1/3/4/7/134721933/pejanimatawobasur.pdfIn PDF document text
    • https://niduzipotobumam.weebly.com/uploads/1/3/6/0/136054567/8967104.pdfIn PDF document text
    • https://xiwabedosebu.weebly.com/uploads/1/3/1/3/131398066/batesoxurarot-besapinafajiwiv.pdfIn PDF document text
    • https://widijozitumude.weebly.com/uploads/1/3/4/6/134688085/pepofoferadunav.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/dazuxujepov/92900786263.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/hoover_max_extract_77_carpet_cleaner.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/where_to_buy_jitterbug_smart2.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/what_is_local_culture_in_geography.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/dejuwexelafarupula.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_off0001955b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1955B 5392 bytes
SHA-256: 02c7c015fee48073358cc0771cc36a5f6a9072260d58f1bdc60645e74a0eff50
font_01_sfnt_off0001a7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7E4 11096 bytes
SHA-256: a8c1e088336ead2077982d5b9686e4995e7e7d7d7fd758bd9e0ed25faa01e50a

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