Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b49bf0c3471d062…

MALICIOUS

PDF

72.4 KB Created: 2021-06-02 22:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08b0bb0d16739b8b259a51babc447002 SHA-1: a6f538a884e9ba618cca4e97368c970f71102d9e SHA-256: 8b49bf0c3471d062c8d398ecdf516404d4acf577bd5a4cb8779a336767554b9c
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, flagging it as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/pbw?utm_term=what+is+the+most+popular+script+font
    • https://sinezotuze.weebly.com/uploads/1/3/0/9/130969777/nuzizoxuwigodujabe.pdf
    • https://pusakinadolelu.weebly.com/uploads/1/3/2/6/132682110/1896279.pdf
    • https://cdn-cms.f-static.net/uploads/4408991/normal_603ffa3eab540.pdf
    • https://cdn-cms.f-static.net/uploads/4367625/normal_601d05cd0c0ae.pdf
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/popinaj.pdf
    • https://cdn-cms.f-static.net/uploads/4454046/normal_603f08f651d18.pdf
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/barakumekasijudul.pdf
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fe07726535ba.pdf
    • https://xelenupexom.weebly.com/uploads/1/3/4/4/134480667/zigorow_lodasavijub_mobafobusa_jojole.pdf
    • https://cdn-cms.f-static.net/uploads/4455183/normal_604d1ef400af3.pdf
    • https://cdn-cms.f-static.net/uploads/4483075/normal_5fd67d34270bb.pdf
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5fdb07da6d838.pdf
    • https://cdn-cms.f-static.net/uploads/4448538/normal_6035c971c94e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fevosezew.pbworks.com/f/grammar_mastery_test_2_answer_key.pdf
    • http://kolasotosexu.pbworks.com/f/zutodegavoribilugedal.pdf
    • http://sajateves.pbworks.com/w/file/fetch/144442860/how_to_play_hide_and_seek_by_yourself.pdf
    • https://uploads.strikinglycdn.com/files/dd64b294-249b-49df-b6f8-02200b2461f6/homelite_backpacker_blower_ut08111a_carburetor.pdf
    • https://uploads.strikinglycdn.com/files/25519e7e-762f-4f6f-a2e7-d7c6f56ed184/whats_the_ugliest_country_in_the_world.pdf
    • https://uploads.strikinglycdn.com/files/2153b545-bad2-45a6-a4ca-d1975d2d8dd8/centripetal_force_definition_geography.pdf
    • https://uploads.strikinglycdn.com/files/014d9138-d588-4205-b558-6ca712c3972b/38940061251.pdf
    • https://uploads.strikinglycdn.com/files/a424dc19-d28e-4a87-9bb5-d7583fc741ee/the_book_of_life_apology_song_lyrics.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_off0000dddf.bin
1d9360831c162329d3ac2d3ef731b91a83e9eadc06e71c5d90a263cabcb9ff4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 5268 bytes
font_01_sfnt_off0000efaa.bin
59ff7700dcfd72ba5382d030da2a39139fd2331bc27a9de2d4d930afa52ad791		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 10688 bytes

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