Malicious PDF — malware analysis report

Static analysis result for SHA-256 77832d1d2e79ec7a…

MALICIOUS

PDF

93.3 KB Created: 2021-06-12 08:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5b6e4a4030c1cfa01ed3f8b67438dac0 SHA-1: 57e99474dd82e849a2425bd415c8e0eb91f01d4c SHA-256: 77832d1d2e79ec7abbaf9d5febd80f70c3426d71640b811717de431fae93d207
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. It functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. No scripts were extracted, but the structure suggests a phishing or content distribution vector.

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://philabc.ru/pbw?utm_term=bl3+gigamind+farm PDF link annotation
    • https://dorixakogika.weebly.com/uploads/1/3/6/0/136051108/jafagotupivetiw-miberolofoti-fumujevatefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427811/normal_600d8760947fa.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/puwigasederoletat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479236/normal_5fda19f282069.pdfIn PDF document text
    • https://zeregosuw.weebly.com/uploads/1/3/6/0/136055393/zijivez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489601/normal_60189fe2d0ce0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4458125/normal_60b72e455342d.pdfIn PDF document text
    • https://sojujigun.weebly.com/uploads/1/3/0/9/130969910/wotasaxewet_rakiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_60b92839c3a7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465694/normal_605fae70427fa.pdfIn PDF document text
    • https://zarogamotelim.weebly.com/uploads/1/3/4/3/134344532/9937773.pdfIn PDF document text
    • https://lamivorimu.weebly.com/uploads/1/3/5/3/135330715/tejowemofedul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_6042f3c98b8d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_603f7b296a6b9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4489992/normal_60b792319858b.pdfIn PDF document text
    • https://mikatafa.weebly.com/uploads/1/3/1/3/131398449/mumumibi-rokelovivased.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_601f23688fe4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458614/normal_5fc5be4da9104.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/9dcb31ae-ddb5-4624-bf19-f5a35cfaf164/arduino_tutorial_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f1c6ba-687f-464a-aa5c-e2c33ac1fc4b/bofejiv.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_off00013048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13048 5264 bytes
SHA-256: 89e2253d180ba0414e30352d5cf4f134ca52263faa55eafad162c4a5d653b610
font_01_sfnt_off0001421c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421C 11364 bytes
SHA-256: d477fc4f31715288fabff611c7b56d952f14346d8b228dd25456c0637dec5678