Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d5b08d50176001…

MALICIOUS

PDF

91.6 KB Created: 2021-03-24 16:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eaf1b316e9f7a511a45ad6d27f1a5bfc SHA-1: b1ee2a627e0a53fd15ddd91c8bcce6de0afc1e63 SHA-256: 17d5b08d5017600171c8ec571044bd61402a3e130bc1abf06d122334fff6c9a0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF documents, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://kuzutuzo.ru/123?utm_term=wowhead+elemental+shaman+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369626/normal_6002c32d6bd3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_60595e643f027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412403/normal_5ffa4f489252a.pdfIn PDF document text
    • https://cdn.sqhk.co/zujijivopuju/78jiaiN/fortnite_save_the_world_missions_guide.pdfIn PDF document text
    • https://karifizamazo.weebly.com/uploads/1/3/1/3/131383674/989cb45df6d6.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/xjfVFgI/hobby_lobby_in_palm_coast.pdfIn PDF document text
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/1378762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530036/normal_603b57923c981.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/ccdmd_ponctuation.pdfIn PDF document text
    • https://cdn.sqhk.co/nivazesoj/YgiSUsj/zowukemomegofu.pdfIn PDF document text
    • https://givexikiduxa.weebly.com/uploads/1/3/1/3/131398224/4791020.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/05b774b2f4efca.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/29332553414.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/bq-cc_17_sba3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_6004cf3e2b1bb.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/gavozamufuzobav.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/d1945389-c3fc-4fcf-b08b-4e3c081af3fd/77537369111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a06163-dba1-44d0-bf6b-965a9abc8e29/baby_gap_girl_pyjamas.pdfIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_d5db3d448b9c4ef6ba3a0aeeb144cf33.pdf?index=trueIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_7af542681519402bb234c828ccb49918.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_4a49beba6f264a9fb650050b6d80dbb2.pdf?index=trueIn PDF document text
    • http://biwosagamivi.myartsonline.com/insinkerator_disposal_switch.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_off0001293d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293D 5248 bytes
SHA-256: 79c755554116c0d54c222c2db7deb7c8383601fe318cc95fc0b49fdf7ad70bb6
font_01_sfnt_off00013b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0D 11152 bytes
SHA-256: 7bb3aa8e53ae4a331a97af3b443ad544b4ac323a8d2a86256dc73a8adac01bda

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