Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd5783ba6c12233…

MALICIOUS

PDF

73.1 KB Created: 2021-06-07 23:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 75aae993a8b931d21b46bae99e4957c1 SHA-1: ca8eee4a836c887f9db16694346625116bafb91e SHA-256: 9fd5783ba6c12233142e2bc26c58c67f7642dc928bee61f1265b68130e582c45
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to link farms hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to nutrition facts, aiming to trick users into clicking malicious links.

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://cructi.ru/pbw?utm_term=green+amaranth+leaves+nutrition+facts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4529281/normal_6068f5458c637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446635/normal_60560c0f4ca21.pdfIn PDF document text
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/4717721.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/repamol-mikofatizis.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4459164/normal_60afe367a6165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_6017867259c75.pdfIn PDF document text
    • https://samituvejasuw.weebly.com/uploads/1/3/1/4/131406365/1126308.pdfIn PDF document text
    • https://vimititop.weebly.com/uploads/1/3/4/3/134339659/92b8385870d9d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496165/normal_605c867729638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393901/normal_603b0e0b82720.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://depowota.pbworks.com/w/file/fetch/144501894/rixomezabisesar.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/f/madenemasiwofegorid.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/f/chhota_bheem_aur_krishna_kirmada_full_movie_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88492528-2cf6-4a16-9f0b-6ae91d56402e/dovuvavatixuzaf.pdfIn PDF document text
    • http://dutamaboxiwa.pbworks.com/f/rejapebigi.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144419127/bsc_physics_handwritten_notes.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/mipatilebajav.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/john_deere_gator_tx_service_manual.pdfIn PDF document text
    • http://gulisapil.pbworks.com/f/50022161487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f29bdd27-1879-47b5-ae2d-9eff25f520dd/wibevobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd529c5e-1d16-4a0b-83ce-9a2cc1f9d671/lana_del_rey_born_to_die_album_producer.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_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 5212 bytes
SHA-256: f3f632b4521b1c4b9352cee32202a5053dff5f94c8efa624231e63d73a3d3c45
font_01_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 10580 bytes
SHA-256: 4d5d8f4d251b2dec52186c163b711db1fbfbb2b10dfdc5e8b6ae97e8db8609a2

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