Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a146505a79a5929…

MALICIOUS

PDF

68.5 KB Created: 2021-09-29 05:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a54851c52204c31cafc349b8b53347fd SHA-1: 8220192af4ca223da495ae25791e2bb100cc7e7d SHA-256: 6a146505a79a5929e79429c7150eb1c98f4a40ec8ceac17959a5fb735ab87811
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of embedded links are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://minjar.mebel18.com/uploads/files/fikefipabov.pdf In PDF document text
    • https://moulindelarroque.com/userfiles/file/23251039376.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/fulepejifaw.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210921093041.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/76086903466.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/79395236051.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/jakerizuwoxikow.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/15722437001.pdfIn PDF document text
    • http://tulga.ru/editor/files/21260019069.pdfIn PDF document text
    • http://geasit.it/userfiles/files/mawofekanodali.pdfIn PDF document text
    • http://erimti.com/userfiles/file/87988414461.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/nuvojuxil.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/96157657082.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/5496706120.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/dugewizovuz.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/35772989867.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/61050044761.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/lorujowesanulokunugulilet.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/xisuj.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/95000215705.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/gunoxomijuwegirelog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ibis+paint+x+apk+for+laptopPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD36 10504 bytes
SHA-256: 32a9de5ffbb69fab154001aa7ae8ae85847100c128c474d92d2a80484c8e9903
font_01_sfnt_off0000c50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 14876 bytes
SHA-256: d6c766b7e0b58a3859f1e839d3864e053c89bd7d47cb1f2c2b4238ed5cfa71b6

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