Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd575b16d1f73beb…

MALICIOUS

PDF

107.2 KB Created: 2021-04-05 06:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fed043376c4b62732a55a852e77cbd53 SHA-1: c17c94af3fbd094fa747901eb9799d20c01df261 SHA-256: bd575b16d1f73beb0f11275ed13e47b9661a2ee96eff430b873aa6b05dda6948
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a lure to phishing or malware download sites. The PDF structure and embedded links are consistent with a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://maypoin.ru/award?keyword=shinjuku+station+map+pdf PDF link annotation
    • http://inter-kalinka.ru/sennheiser_ew_100_g4-me2_1g8-band6r1mm.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/zowofawibatefivokodezes93ose.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5fe058d8417cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424027/normal_606788a4cb78a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_6062ee806226a.pdfIn PDF document text
    • http://on-arenas.com/47146570395hs5wv.pdfIn PDF document text
    • http://lasns.fun/64959742856zrh58.pdfIn PDF document text
    • http://xtreme-sport.ru/95438279879ycbx2.pdfIn PDF document text
    • http://eu-study.ru/tamil_essays_for_grade_6_studentsfevv8.pdfIn PDF document text
    • https://gopogusefivow.weebly.com/uploads/1/3/1/4/131406686/timewej.pdfIn PDF document text
    • https://pavadugubuwab.weebly.com/uploads/1/3/4/3/134309483/2956812.pdfIn PDF document text
    • http://fortysgjdk.fun/pixel_puzzle_collection_mod_apkd3h7p.pdfIn PDF document text
    • https://mukeluxera.weebly.com/uploads/1/3/4/5/134528716/wuteb.pdfIn PDF document text
    • http://zatoboyvibor.fun/ntc_dictionary_of_american_english_pronunciationkpv1d.pdfIn PDF document text
    • https://dopozigixojak.weebly.com/uploads/1/3/4/5/134509916/733680.pdfIn PDF document text
    • https://papukelub.weebly.com/uploads/1/3/4/6/134666119/5094626.pdfIn PDF document text
    • https://zobirifojufegot.weebly.com/uploads/1/3/4/3/134374070/tumaxor_fonax_xawisolexagoxu_zoremodarotan.pdfIn PDF document text
    • http://how2clever.com/68891809413lyao8.pdfIn PDF document text
    • http://cz-nitrof.website/4930999157a8rxd.pdfIn PDF document text
    • http://agencymedia-ig.com/jipexinl8xm.pdfIn PDF document text
    • https://mitadelo.weebly.com/uploads/1/3/4/7/134712934/daf4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_60249791f15f6.pdfIn PDF document text
    • http://tb-films.ru/xusikilaniwewobofim05o76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 22328 bytes
SHA-256: 3400a8edcc89229a9aeb9386f2ea79f8487548602bbe4374ce06ea7bc3434d5b
font_01_sfnt_off000165b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B1 5396 bytes
SHA-256: e5479a3e1d026f2793ec7579719c16c03ddda006484e6039c9b847ff838af1d7
font_02_sfnt_off000177f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177F0 11272 bytes
SHA-256: 1290b6cc5f441663102c15851c63c9a51abfb4c70cd184eeedfedb96ce5a2da3

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