Malicious PDF — malware analysis report

Static analysis result for SHA-256 1978364bbf6e2b27…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 14:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43a1332ce56c713b09d47c628521dfc8 SHA-1: e5be86499d26e3b0512309f568b86decdcabbac0 SHA-256: 1978364bbf6e2b271f61f561d96589b5856d0eeccde933794034b1d96a10e487
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam lure. It contains numerous links to external PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the presence of multiple disposable link farms and the overall structure strongly indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://triatlonshop.cz/userfiles/file/bexavolajopese.pdf
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/93791499365.pdf
    • http://naphogacomposite.com/upload/files/97747963865.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613557f9eccca---mimux.pdf
    • http://santabruna.cl/upload/file/11739680270.pdf
    • https://costarica4d.com/contents/files/13831563368.pdf
    • http://textstricker.de/benutzerdateien/75169871171.pdf
    • https://lotte-ppta.com/beta/assets/file/19902238583.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414eae9034---wupixipudagumewuxu.pdf
    • https://ahha.az/userfiles/file/53485499451.pdf
    • https://bushregenerators.net/userfiles/files/68967369684.pdf
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/ferugufuzegami.pdf
    • http://ingmarcofaedi.com/userfiles/files/xevazeta.pdf
    • http://bancasemecanino.com/userfiles/files/42777598087.pdf
    • https://melnikhouse.com/userfiles/file/44453367749.pdf
    • https://vilnius.cvzona.lt/resources/img/files/zabomerijiseme.pdf
    • http://bumsnab.ru/uploads/files/ripibosixon.pdf
    • https://tommytest.dish1314.com/data/html_editor/files/36085191268.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/94399174409.pdf
    • http://prepearl.com/uploadsfile/60144904101.pdf
    • https://ontogepszerviz.hu/editor_up/badowab.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/puriginuj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=usb+dvd+tool+for+windows+10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc12.bin
0fa9816210b87f10ec043e65f6e5954552c315b2846bd3756b25c9d2f7370883		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 18420 bytes
font_01_sfnt_off00010cae.bin
3e80507dff5ad9cae1a89b71f2468e0f80c59c45231f0daaee09de6a3b0fd50e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 10524 bytes
font_02_sfnt_off000124c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.