Malicious PDF — malware analysis report

Static analysis result for SHA-256 19367f42bda3f81c…

MALICIOUS

PDF

72.0 KB Created: 2021-03-31 18:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 487b8e3240ec40fab2c99fdd93157afa SHA-1: e938461fda494c64d69d72803e38f6134578cd28 SHA-256: 19367f42bda3f81c79b09b6afae93dd20066b7aa10be817eec15c3b9975df3d0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or trojan activity. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=bengali+full+movie++a+to+z
    • https://rebodegumirimak.weebly.com/uploads/1/3/0/7/130775130/8e64d092.pdf
    • http://hookup673.site/agent_vinod_hd_movie_freewseau.pdf
    • http://creditscorehelp.info/suromavimibenm2cz.pdf
    • https://defuzeje.weebly.com/uploads/1/3/4/8/134883556/5ed5ca164110.pdf
    • https://rolorizumi.weebly.com/uploads/1/3/4/3/134316308/5140508.pdf
    • http://wiinorama.website/38933984666598lq.pdf
    • http://fastcreditreport.info/biostatistics_for_dummies_cheat_sheet8dbvq.pdf
    • http://freshmind.net/the_signal_and_the_noise_downloadznsm3.pdf
    • http://changepass.online/moksha_en_el_hinduismoxccjv.pdf
    • http://maykistore.ru/73594964138uxf2.pdf
    • http://copyright-rules-help.com/97705710209f485u.pdf
    • http://dimax-matrasy.ru/78853140546jm42y.pdf
    • http://dexaputanit.mygamesonline.org/42562821920.pdf
    • https://wevikafajaxa.weebly.com/uploads/1/3/1/1/131164556/teginuvitavew.pdf
    • https://gutakabumediru.weebly.com/uploads/1/3/4/4/134492877/vozelej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/faxaxos/55110073445.pdf
    • https://s3.amazonaws.com/lowuwofuxali/95224492042.pdf
    • https://s3.amazonaws.com/doxifuba/45522100348.pdf
    • https://uploads.strikinglycdn.com/files/eb3c6f2a-5dbd-4b66-bd1d-330af8b00220/stories_of_your_life_and_others_goodreads.pdf
    • http://tuxefunuzire.atwebpages.com/93472757048.pdf
    • https://s3.amazonaws.com/zamemigojat/folly_beach_surf_report_magicseaweed.pdf
    • https://s3.amazonaws.com/lovomijelun/date_and_time_format_in_shell_script.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd58.bin
9704607b3296532e10d4e92bf6a8e9af838c666e16d29f040621f3daa7ab0718		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 4972 bytes
font_01_sfnt_off0000ee51.bin
eaac3a49053364767ab6876dd6b735a7fc4228a27b3e722c108cf561c88a4d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 10652 bytes

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