Malicious PDF — malware analysis report

Static analysis result for SHA-256 673389873f533b6e…

MALICIOUS

PDF

79.3 KB Created: 2021-03-28 00:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eecad5841969e3186de183eacf1b79d6 SHA-1: c02e529dd2c259cf80d913f0f3e035dded7e9889 SHA-256: 673389873f533b6ed721a298f5f980106acc0ee16b3e331f3efc9fafcbaffb91
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains multiple external URIs, including one pointing to a link farm on disposable hosting, suggesting a phishing or scam campaign. The presence of a 'download button' heuristic further supports a malicious intent to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/strik?utm_term=harrison+book+of+internal+medicine+latest+edition PDF link annotation
    • https://cdn.sqhk.co/feripamapuv/gFjbigl/elife_router_default_username_and_password.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_602826b6d318f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_603f721bd4490.pdfIn PDF document text
    • https://cdn.sqhk.co/wemupaxuziv/Nlij0kM/4342349829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_60531d0e65595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420602/normal_60472b7eb1ca2.pdfIn PDF document text
    • https://cdn.sqhk.co/vopuvafamiw/aghIjhD/foosball_3d_model_player.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jexijer/fairfax_county_virginia_land_records_cover_sheet.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_ca16f64601834fb5a2fff55a750ca502.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wukara/westward_expansion_crossword_puzzle_answers.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_123ca61863e44cc3a5e7066469d89815.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/fitiloj.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_0b1de521c7bb434db6b11f77b7e290d9.pdf?index=trueIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_29bfd59ea3f94c7e8a0c646bdbd3b946.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kaxukok/vopowozimisidev.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/tepotoruraz.pdfIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_082041b93ec64f92adf9f783e21d7e10.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_bfe60b57471a4ba5a1873c0750a1632c.pdf?index=trueIn 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_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 5332 bytes
SHA-256: 05187d52642b8112d342d5121565d58bd4dbb4ab5dd3e5a9d41c6a63469df758
font_01_sfnt_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 10936 bytes
SHA-256: f79c170e2edf34754a05e86290b2e9e4b6f2e0432abc58a21cbaa818546a7f0e

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