Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6e5d82346343d5…

MALICIOUS

PDF

63.5 KB Created: 2021-01-01 04:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ac51ef8331090f3782e76e303d30bc1d SHA-1: eaf8e932044983122c8ab539bc4e5009115277b7 SHA-256: ca6e5d82346343d5d2cb4776bceb59079c0b7f55e2abd868b8699b9c633ce083
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical PDF_SEO_LINK_FARM rule indicating a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The document contains numerous embedded URLs, with one pointing to 'traffking.ru', suggesting a phishing or malicious content distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to potentially malicious content or further download stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/123?utm_term=vocabulary+workshop+level+orange+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459780/normal_5fb86a8104d44.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/bxhdMgg/51254684781.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/retibaloma_nizufekevag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5fa472dcd8d7f.pdfIn PDF document text
    • https://telabafulux.weebly.com/uploads/1/3/0/9/130969700/piril.pdfIn PDF document text
    • https://larojebuwovu.weebly.com/uploads/1/3/1/3/131382373/votufavexo.pdfIn PDF document text
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/9864258.pdfIn PDF document text
    • https://jekazaveme.weebly.com/uploads/1/3/4/4/134470158/6767590.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/nijudow/gigibebi.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/25994653795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25108bf4-3d9e-4cdb-b3e4-47ebcdc945f1/48151134258.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/amazon_fire_tv_stick_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/idsa_guidelines_yeast_infection.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5F 2888 bytes
SHA-256: 604725ebf9bf0d9ab2bcf42cb3b9eb1946ba017bf99d5c2e6531ff47cfbc4b7a
font_01_sfnt_off0000b9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A2 5840 bytes
SHA-256: 7f9b1566e87292196d10d6ca5042bf1c676326db27f0145bdec062fa1cef2efe
font_02_sfnt_off0000cd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9F 10532 bytes
SHA-256: 4ca2ed876865f7a031b8eb54ed6941952dafc44c3d55d59ac7a41290b7eaa607

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