Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83117df8dea142d…

MALICIOUS

PDF

78.0 KB Created: 2021-02-10 16:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5603ab4a005452d751c43ed195c66c78 SHA-1: 848a13333662cb0495441a219ce2a5204a231b46 SHA-256: d83117df8dea142d91d88c0bc85bc340906523aafe7fc66f4719400090f389e1
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious or scam content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the sample as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=jose+gonzalez+wrestler+son PDF link annotation
    • https://cdn.sqhk.co/gulifunanale/Z6ijLia/adults_coloring_book_pinterest.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/igDhfje/happy_hanuman_jump_game.pdfIn PDF document text
    • http://instup.xyz/ancient_origins_card_listwxsbx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446280/normal_600a1ed518ad5.pdfIn PDF document text
    • https://cdn.sqhk.co/puvivefujef/ghdM8ha/grandmother_clock_repair_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fcdcec66c970.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/heGchej/venozulevajaxolaxawunime.pdfIn PDF document text
    • http://bahis-sikayet.com/82090057746kulrx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5fe13ba0c09c7.pdfIn PDF document text
    • http://mydenverneighborhoods.com/19404108883mw2x3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404503/normal_5fd045bb42fca.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/hcjgifo/45061926249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5fd6fcf300cb2.pdfIn PDF document text
    • https://cdn.sqhk.co/tevitogaperu/jjUieid/downloader_for_instagram_pro_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jixojamut.epizy.com/bobibuloviralapinitu.pdfIn PDF document text
    • http://nevejekegasa.epizy.com/nipagakololalenimal.pdfIn PDF document text
    • http://mowesedapi.epizy.com/new_punjabi_song_2019_bestwap.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_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 4984 bytes
SHA-256: c99fb981c199bbecb1eadb494ae9fbe16fe10967d51190afcf1b34f3dbbb3a76
font_01_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 11252 bytes
SHA-256: dfb12addb776cd78e824423a2588e6816b99b1e71b1e2c569a44af312b35f953

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