Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b51204844437b3…

MALICIOUS

PDF

74.6 KB Created: 2020-11-10 23:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9a8f364ad40d6f07250d9fd41a734b4c SHA-1: 3249587bc69defad397736460a48e0c13188b706 SHA-256: 19b51204844437b37b07c324adfcf239402cf829cdbb042ee72f1f825645b777
196 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 or SEO manipulation tactic. One of the primary URLs, 'https://trafficel.ru/123?keyword=dulces+animados+png+online', is identified as a redirector for free-download phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful content.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?keyword=dulces+animados+png+online PDF link annotation
    • https://rusigeju.weebly.com/uploads/1/3/4/5/134596119/2083912.pdfIn PDF document text
    • https://vajudufebebugi.weebly.com/uploads/1/3/4/6/134696622/tarokuk-vumegamujimozod-gesojafego.pdfIn PDF document text
    • https://variwigegepug.weebly.com/uploads/1/3/4/3/134348450/sidoraromiluwit_zovizokugeje_dafibezif.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/tijisozakure_kifimazufafi.pdfIn PDF document text
    • https://rewudorabemomaf.weebly.com/uploads/1/3/4/2/134234845/taxipozowawakerut.pdfIn PDF document text
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/xusunegojifavo.pdfIn PDF document text
    • https://nidixinaxob.weebly.com/uploads/1/3/0/7/130739699/8715314.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/c6cacebe86.pdfIn PDF document text
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/c8731d88213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_5f8ed2ef2a485.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/be5457c0-b834-495f-b591-66844b595601/66038780207.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/what_is_an_epic_hero_in_greek_mythology.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/25095364229.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/literature_review_on_carica_papaya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4307a0fa-03fd-492d-8a17-0e9f917d2ab3/xopinodupoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/lg_42ln5400_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 5296 bytes
SHA-256: aef39c6f4c386b151a91ffa5a0450a2fd166713c8b046453bc45e8bf65d9518e
font_01_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 11680 bytes
SHA-256: 185bcd0b70625370707963fe56c99e20aa7ec5a9aa2350e7e4bf26b85c0d5a91

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