Malicious PDF — malware analysis report

Static analysis result for SHA-256 72625fb745194f02…

MALICIOUS

PDF

76.4 KB Created: 2021-05-25 10:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a534ed460960b4910b144db518b007f5 SHA-1: 39a2d3976701b70edb0aee126971e6dd6bfef95a SHA-256: 72625fb745194f0275ed47d68f89f115993fd1df7539bcd271d071a1badd3ceb
186 Risk Score

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 0.9991

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://seumenha.ru/strik?utm_term=basic+english+grammar+rules+with+examples+pdf+hindi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383912/normal_60260eec2f9e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_602681233619f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479938/normal_602e1cc423231.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_5fc87aa50b40e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384316/normal_60029e624e388.pdfIn PDF document text
    • https://vinaribibivo.weebly.com/uploads/1/3/1/8/131871854/7465439.pdfIn PDF document text
    • https://wemodaxade.weebly.com/uploads/1/3/4/6/134689579/3916501.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469828/normal_5ff93a023fc83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_601df475e22ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_5fd7dc6aedd9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_6047d69e1ef89.pdfIn PDF document text
    • https://famojiwogupoj.weebly.com/uploads/1/3/2/3/132303340/dugadedixupop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_6044faa6b94ca.pdfIn PDF document text
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/biwuwowuduvugagizop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_602aff4763b9d.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/5604116b-5804-44cb-991c-b17f146add4c/the_power_of_love_celine_dion_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8dd008b-0b1d-464c-87b3-ccbf733d9dec/zuwanovur.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/83315682755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ebf215-ce96-456d-8cc4-e2f32370157d/natuxibofuxatafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f67268f-5be5-48d4-b861-1c5b9fa71995/jomenagelemamosagoxasotu.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/top_30_question_and_answers_at_interviews.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/qantas_frequent_flyer_membership_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/zumozulolomab.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/bosutixafiluwofomiluzopo.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_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 5776 bytes
SHA-256: 065541df38d1ecedde54488fcb74ac816b03776a63a7cff5d5464076c2b8df36
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 10476 bytes
SHA-256: 0f4a4006c4e9f2b86de6bd956b1522b79d0f9c17894385b033de30b1f2a20d41