Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fbcba0ea78e50c…

MALICIOUS

PDF

57.5 KB Created: 2020-11-25 05:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1598df308924b36d7858819ec98e8041 SHA-1: 158ae8d41637835e8019de49517e4c1ae93ebf23 SHA-256: b6fbcba0ea78e50cb5158edf7c2ca8be998b5852b682d63b4eded28d029979af
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with one pointing to a known malicious redirector. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or spamming campaign. No scripts were extracted, but the structure suggests a malicious document intended to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=dna+replication+fork+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_5fabc6371f1da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5fa1a05279266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403937/normal_5fb552096794e.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/ziranara.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/kupavenuwirupezef.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/pepefopawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_5fbae8ff6f572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_5fa5e3ab25fbb.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/xoxefage-wubawofa-xenopumizowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5f8b60b6c7d25.pdfIn PDF document text
    • https://dumopodowejuna.weebly.com/uploads/1/3/4/5/134591879/tovukofonuxuz_vinotigosadop_zaterom.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/2adbe6c5-57c6-40c8-83f2-2d2974584802/36981819461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240098c2-b8b4-4240-8ac2-15f565c4224b/fuvezoxomekajefogavekap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a9627b-f7ee-4a16-991c-bc44709fa64a/detrola_record_player_belt_replaceme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e1d816c-66f9-443b-8498-47dc68c33e6a/gltools_apk_xda.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_off0000a91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA91E 5260 bytes
SHA-256: 5b53d959e7fda467f358fddbb5d4613bb58363f7eab6c5fce66e5b017d6f2995
font_01_sfnt_off0000bb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB18 8872 bytes
SHA-256: 59f00d607934575e33510b920c56d3cf6d0ca19c4a86199e59c3cbf592712e05

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