Malicious PDF — malware analysis report

Static analysis result for SHA-256 5818de8362c5e148…

MALICIOUS

PDF

71.6 KB Created: 2020-12-27 23:19:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fbe7c9b910ce1b538e3f2e2efb6f908d SHA-1: 50cb3b19d859911c878745c97b67ea90cc9959ea SHA-256: 5818de8362c5e1480fa0d7593e428c3501f73f3871cb0539c2f620555ad5ffb8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/strik?utm_term=pvp+iv+calculator+shadow PDF link annotation
    • https://gitinegu.weebly.com/uploads/1/3/4/6/134648864/sabesekagotemag.pdfIn PDF document text
    • https://fozafilamo.weebly.com/uploads/1/3/4/3/134314768/4590680.pdfIn PDF document text
    • https://vejexuwelukilik.weebly.com/uploads/1/3/5/3/135340180/nopumajojafefo_zavijaxugegij_fatajeja_didujiwipef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_5fb6ba020adde.pdfIn PDF document text
    • https://cdn.sqhk.co/risevejuxik/giibi6W/50876618934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470409/normal_5fdfac61a8c17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401712/normal_5fc5cb17a7ff5.pdfIn PDF document text
    • https://wuzesitawe.weebly.com/uploads/1/3/4/7/134733123/1a1b0f67c80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403688/normal_5fe5a1e411147.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/06d98377b.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/guzubudasonufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422908/normal_5fc0284d565af.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/zesotat/handprint_reindeer_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/49568855186.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/gupiwovixifosudu.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/dark_skinned_blood_elves.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_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 5316 bytes
SHA-256: dfb42832680884a0c56020ef5c8022d8ae2e6d0fce98ecc9880ca5211e177b98
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 10200 bytes
SHA-256: 0e1efc573f1eb8ac2aeb7d18a33d7d06c6cdaff7e37898c07387867c7b83cdc9

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