Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c9dca2eca1f873…

MALICIOUS

PDF

71.2 KB Created: 2021-04-05 06:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cf69b8f09def987798d744f4e82f1f2f SHA-1: c349f71620780eb0564e4f2f103bb16840ecdeae SHA-256: a6c9dca2eca1f8739ff97bc5e5a23d8271985f996bcbb936d1e85b6f88faf9bd
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URLs, many hosted on disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'crane signal chart pdf', which is likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=crane+signal+chart+pdf PDF link annotation
    • https://cdn.sqhk.co/mimofeto/ifQL7ih/96241037519.pdfIn PDF document text
    • http://sozetil.66ghz.com/92221299651.pdfIn PDF document text
    • http://parexapubep.iblogger.org/acurite_5_in_1_wireless_professional_weather_station_review.pdfIn PDF document text
    • http://tuvetetin.22web.org/fafosa.pdfIn PDF document text
    • http://datekal.22web.org/lg_v20_second_hand_price.pdfIn PDF document text
    • http://good-production17.site/85881337282qi98a.pdfIn PDF document text
    • https://cdn.sqhk.co/xizowabik/gjjh4Po/mujas.pdfIn PDF document text
    • https://cdn.sqhk.co/joxusozomilo/ePehhid/krabat_film_english.pdfIn PDF document text
    • http://podeves.xyz/65671645555brp2w.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/idhgggB/does_michaels_carry_paint_by_numbers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_c5ad466854a04afca3c8649b17b3617a.pdf?index=trueIn PDF document text
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_78cfba2f2bf54b1ab854ab1d59b0757f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/brush_adobe_photoshop_cs5.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/lagu_rhoma_irama_dan_camelia_malik.pdfIn PDF document text
    • http://wefuzage.epizy.com/makalah_bioplastik.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_c9c70a8369b641939085b5457e4fed6f.pdf?index=trueIn PDF document text
    • http://tavuvije.epizy.com/96427393007.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/lotupi.pdfIn PDF document text
    • http://babokad.epizy.com/kozoripitam.pdfIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_f8f38597672c489bb92a6dfa190e0c7a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/tofomo.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_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 5320 bytes
SHA-256: 96e72df37096fb934e2e1930234dcf00eb918bc61b6d2e0d30ed545b888f75d8
font_01_sfnt_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 10136 bytes
SHA-256: 609403e5b3ba63cabfccd8b7bea5322cc8ff8d50a8b11dc41805b0fd391a1bad

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