Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa97c6fddda6b8b…

MALICIOUS

PDF

86.7 KB Created: 2021-01-16 10:38:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f666fa8bc1bee3c48c21f15e755eea4c SHA-1: 2204a71f40dfaa060c78e833f2c0fb2663a9e821 SHA-256: daa97c6fddda6b8b6e4b45968955ed770b49244998f39f1253978ce232b75ad4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm designed to distribute malicious content or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?utm_term=bstc+paper+2019+answer+key+reasoning PDF link annotation
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/ridoxugo-nefufirugakusi-pevogomoxi-relomikututezom.pdfIn PDF document text
    • https://pusazaninad.weebly.com/uploads/1/3/4/3/134358808/falipujewagi-lagozatumeki-godadedunimidek.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/widesokuvebebopoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_5fadd416d1726.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381528/normal_5fcdc0f3a5aea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_5f9183ea20747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5feeb38387db9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_5fdc18f6ba7bd.pdfIn PDF document text
    • https://dixetomik.weebly.com/uploads/1/3/4/7/134775969/maruvene-tekiwujurarigo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490128/normal_5fe5ee2d662ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389095/normal_5fcd73baa3d8d.pdfIn PDF document text
    • https://site-1235917.mozfiles.com/files/1235917/dungeon_keeper_gold_dosbox_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/mavixu/96906563981.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/accounting_test_questions_and_answers_for_job_interviews.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 5856 bytes
SHA-256: 1f67bdfb68dece9302cfb43add6adccbc5f856a9157335cd7c281482d9bea1ee
font_01_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 11308 bytes
SHA-256: 178c98c69e2e79c68b02d2302f6764fe81163727b4cfe8fa05b946df25bfa1ae
font_02_sfnt_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 9068 bytes
SHA-256: e1ad56f9ac174b3ed365251ad71e73ac36e5308454ac3034d05cb984b27686c1

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