Malicious PDF — malware analysis report

Static analysis result for SHA-256 1785c1221fa2733a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 22:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1ab05195c2fc4387eba0afd778eead7a SHA-1: 02265f572e2ca5dcb7381ba698f111cd5de7269d SHA-256: 1785c1221fa2733a4101921034d85b9c375c98849f4eca05d4bbb3dfde089a4a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream. It contains numerous external URIs, many pointing to PDF files hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not fully detailed, is a common vector for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/xenebeb.pdf In PDF document text
    • http://jgbt.us/pds/userfiles/files/63719700608.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/dozapuluxilemisaxedutulu.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/65214303325.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/lukununupejiwigosipo.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fec0f9e3ed---miwomosapabi.pdfIn PDF document text
    • https://umutfm.com/resimler/files/40708621863.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/sofuguniwasupog.pdfIn PDF document text
    • https://izometal.net/mm/file/gevaxilazesis.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/momumimalipudegifos.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/vemiriwusulupoteru.pdfIn PDF document text
    • https://tsegypt.com/file/41572828706.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/59897384311.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/18162793443.pdfIn PDF document text
    • http://web5gstore.com/Files/files/jiwital.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1a29ba19---15147420180.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/131559558108.pdfIn PDF document text
    • http://immopolignano.lu/images/27185724534.pdfIn PDF document text
    • https://premiersuli.hu/files/files/fejobidarosukuxigu.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/kelujij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=happy+birthday+my+lovely+son+imagesPDF 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_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 18128 bytes
SHA-256: c5bc734d966527afe57576c9ff7a0651a125d3b8fdb9111e4c7a6060f66b0661
font_01_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 11152 bytes
SHA-256: 6c2ae99ff7f14fc65af590d68397afabad58953909327b43330088ab4e3108d8
font_02_sfnt_off0001296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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