Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1eac32ab276f16…

MALICIOUS

PDF

71.0 KB Created: 2021-01-31 22:31:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00d37f0e79070cde096061c0a0d3aa08 SHA-1: d2bd71b145ba08c8cb0343513d2dddc014e4532e SHA-256: cc1eac32ab276f167f12e0e687a214191be33001a4a0588178a12ef11d3cd70c
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

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://bologen.ru/aws?utm_term=a4+envelope+template+indesign PDF link annotation
    • https://cdn.sqhk.co/vibisidumes/hiZrghN/samsung_galaxy_xcover_4s_test_kamera.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/gejjlNd/nugesep.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/FWC0gdg/capsule_wardrobe_2020_winter.pdfIn PDF document text
    • http://forecast.bet/63143609495y3ss.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesiwafo/8ieicB9/call_of_duty_zombies_unblocked_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5fc5afb6bebd5.pdfIn PDF document text
    • https://cdn.sqhk.co/renapudovi/PjaidKT/65077770976.pdfIn PDF document text
    • http://mybatut.store/runner_fish_picturep74tx.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/bifamomove/calcific_tendinitis_ultrasound-_guided_needle_lavage.pdfIn PDF document text
    • http://guxozuzemonixe.epizy.com/95982298224.pdfIn PDF document text
    • http://wekumut.epizy.com/25331727816.pdfIn PDF document text
    • http://nanaxaj.rf.gd/bnmu_part_2_result_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/hedging_techniques.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_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 5320 bytes
SHA-256: cefdac3221f64c922474e2297f11fabf865b030ae0317e17252a211cfe4aed4b
font_01_sfnt_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 10912 bytes
SHA-256: 20ed4d422ba49ab11dec1558abb3505663f7c12af1d0383f2abead278bff6f53

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