Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dacc4e61ef19f4…

MALICIOUS

PDF

73.9 KB Created: 2020-11-21 08:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 059ab0bf61a6368fdd27f62a4b37a01f SHA-1: 2fad4052d651835e1e65e7d54e61e560377272c3 SHA-256: 91dacc4e61ef19f4e9d3c80ab1bc8d68db62d160db8ca173da795e228c0ed6a8
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs point to suspicious domains and Weebly-hosted PDFs, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the heuristics and embedded URLs strongly implies exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=i+dont+always+meme+guy In PDF document text
    • https://jokatilowiwege.weebly.com/uploads/1/3/4/3/134369617/mikawisu.pdfIn PDF document text
    • https://dujodorenenap.weebly.com/uploads/1/3/4/4/134488447/muravew.pdfIn PDF document text
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/nudav.pdfIn PDF document text
    • https://farupixin.weebly.com/uploads/1/3/4/3/134314126/76848b16266c3.pdfIn PDF document text
    • https://safusubugem.weebly.com/uploads/1/3/4/6/134609944/pulamenaf.pdfIn PDF document text
    • https://josafobuwevaj.weebly.com/uploads/1/3/4/4/134464642/zekiko.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/4618049.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/susonanezaj/15096598414.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/92119322574.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/6th_grade_order_of_operations_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/springboard_geometry_embedded_assessment_3.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/4k_video_er.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/csub_spring_2020_final_schedule.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E9 5364 bytes
SHA-256: 230d4a94dc3a1dd9f28c64cb1e283918c2381a3c5f2c83ce9a234b0af1177e80
font_01_sfnt_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 5180 bytes
SHA-256: 7aad629298fb5f632ef2a1acd7ce63a014b68e2173a4488a87e72f643378e9a7
font_02_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 2060 bytes
SHA-256: a1d81b5551216932ce702d7443f61d33cad607d0082e189d4dd506663a01ae02
font_03_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 10664 bytes
SHA-256: e9a1c032a1ec83a343a12427e105eb913b46e0f28003692fb856a7b3803a2ad8

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