Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3a00e4e80d1137…

MALICIOUS

PDF

72.1 KB Created: 2020-12-24 21:31:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 525dc577796f67512edfc63b4d9ff665 SHA-1: 63a6ed18fc592fb745d587ec8b6f49b756045944 SHA-256: de3a00e4e80d1137335f9af62fd7466ae5f78d3283ea1fc545c7bec089d9fc97
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, including one pointing to 'trafffe.ru', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to French grammar worksheets, masking the malicious intent.

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 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://trafffe.ru/aws?utm_term=french+interrogative+adverbs+worksheets PDF link annotation
    • https://zegaturivelegob.weebly.com/uploads/1/3/1/4/131437779/9c3b3.pdfIn PDF document text
    • https://cdn.sqhk.co/javufikari/jcjf9mF/stickman_fight_animation_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/kogexuwalu/gdQjgG1/xusisuxemogenisadeni.pdfIn PDF document text
    • https://cdn.sqhk.co/kalijada/UhfDhal/xekagisiguv.pdfIn PDF document text
    • https://bokesaxigalul.weebly.com/uploads/1/3/0/7/130776824/mubakejuvuzino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5fbdc28056ce1.pdfIn PDF document text
    • https://wuwonerosetopux.weebly.com/uploads/1/3/1/6/131606808/14650.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8a8f36cb-7528-4250-8a24-49643de2be6f/new_jennifer_lawrence_nudes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b92e40fd-65d0-408b-b64a-b8b3bc6b6a9a/35298192082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f46922-ae77-48ad-8e64-e192a864afef/vasawula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08faf2b0-73ee-424e-b329-f83b26f23d45/vibatafuzigenapojafilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d47ad69-a34c-4ec0-9a89-5b0aa2314618/wig_master_seinfeld_script.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/south_african_cv_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/xenitawu.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_off0000cf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 5268 bytes
SHA-256: 93aaefac8b89a7490fc25086d13ad5bf88d8298aec0a72e74fc4d028c9b62b40
font_01_sfnt_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 10600 bytes
SHA-256: 44833fd8ef62e9ab4a6c4faefe0394751456f7e9a0f7d221b7dd1420847feab1
font_02_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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