Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e3876cd71f00fc…

MALICIOUS

PDF

59.9 KB Created: 2020-11-21 07:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 30e09e6ce50dc306910a99b7db6c7d71 SHA-1: 943c25c36fd1d2ac56f4d8e8b7ac834064b11b2f SHA-256: e7e3876cd71f00fc7730115a5e6e9ca77539ff392fdb09b4cb6b645240151b82
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are to benign-looking documents, suggesting a link farm or SEO manipulation tactic. The primary external URI points to 'trafftec.ru', which is likely part of this scheme.

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
  • 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://trafftec.ru/123?utm_term=schaums+linear+algebra PDF link annotation
    • https://kexuminuki.weebly.com/uploads/1/3/4/3/134310960/8740445.pdfIn PDF document text
    • https://bageribo.weebly.com/uploads/1/3/4/5/134592059/897960b879e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_5fa76f7ce46d2.pdfIn PDF document text
    • https://vadibuxazuxubaw.weebly.com/uploads/1/3/4/8/134855910/gapepufa.pdfIn PDF document text
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/xaxesomibe_voloxes_mofugaw_livomagirigap.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/litamagul.pdfIn PDF document text
    • https://waniremupamed.weebly.com/uploads/1/3/1/4/131407535/mazuwevibejelubolo.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/40b808dd9b7.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/kozibowisenatu/google_maps_into_sketchup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad375291-7f0c-4132-946d-6566f3621a76/algorithm_for_finding_prime_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/access_music_collection_database_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/kaxuwodolezakabenoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c19a2f-dd2c-4d50-96a0-52279dba91b9/2907295762.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/sex_emojis_for_iphone_8_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/34994509498.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/burraco_online_per_android.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_off0000b0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D9 5456 bytes
SHA-256: e70b40ff1a50a00b11dc1bbe9fa3bffbb5ac8f3c8347e91a5681666b815401c0
font_01_sfnt_off0000c33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33B 9356 bytes
SHA-256: d7ba0b85a4738381287325f3a6ab6fb76b77b3235eb7b85a3185cb77fa62a7c3

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