Malicious PDF — malware analysis report

Static analysis result for SHA-256 89df8433af2acc63…

MALICIOUS

PDF

71.6 KB Created: 2021-01-08 18:17:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0c3ecda3b5f2d8099926aef5233e3967 SHA-1: b8018de6b37412503b2f54e037c686c163dc35b2 SHA-256: 89df8433af2acc6365b271a1bdabbbe960b4f722c26b52a59d360cbacf9f6d9e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to lure users to malicious sites, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafftec.ru/aws?utm_term=bar+graph+worksheet+grade+6 PDF link annotation
    • https://koxamuru.weebly.com/uploads/1/3/4/8/134890845/jewudoruresafiwol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489412/normal_5fc96a2f9b1e1.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/hhzLCYL/75896641472.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/1zQrdw7/super_mario_adventure_set.pdfIn PDF document text
    • https://safodejinuvi.weebly.com/uploads/1/3/4/7/134753113/1622071.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/jEihvgj/47809380493.pdfIn PDF document text
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/sutojazopafijo_jisejipunen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5f99610546600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466661/normal_5fa718c0d2a81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423715/normal_5f9d396103bd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5fdea79d653e4.pdfIn PDF document text
    • https://lanuwoga.weebly.com/uploads/1/3/1/6/131637333/5540070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_5faf14980885b.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/Kichdxv/womens_christmas_tops_and_jumpers.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/688c6d9f-0385-4140-b0f0-38738e676a12/ela_regents_january_2017_answers.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_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 5548 bytes
SHA-256: 4e0d90942cb93b5b374f06182c9040d98570e58374b7b9170e8c1bb1cbbbe5d4
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10360 bytes
SHA-256: 15d61348cd48b446bbc8e8d930798f5d925deeb28bb9de71a2e637e7f1497546

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