Malicious PDF — malware analysis report

Static analysis result for SHA-256 800e76e105670d19…

MALICIOUS

PDF

77.1 KB Created: 2021-04-28 23:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7733c719ad8291381f15e9149dee144d SHA-1: 7b2c1ad1d3b4d1b85b245c174fa9e1627464f9cb SHA-256: 800e76e105670d192c3d9f8d7df1159f877460c74b00a4147ff8d3f67e6ab9a8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://jacksth.ru/strik?utm_term=how+to+pair+auvio+bluetooth+headphones', suggests a lure related to Bluetooth headphones. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive linking pattern points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=how+to+pair+auvio+bluetooth+headphones
    • https://cdn-cms.f-static.net/uploads/4455194/normal_602687afc1d5f.pdf
    • https://cdn-cms.f-static.net/uploads/4489838/normal_605c72ad9848a.pdf
    • https://cdn.sqhk.co/tofatuxurejo/etji1hg/37343203159.pdf
    • https://cdn.sqhk.co/jawutuwek/PggcifM/yeet_meaning_cambridge_dictionary.pdf
    • http://nepasise.iblogger.org/49054845909.pdf
    • https://cdn-cms.f-static.net/uploads/4403937/normal_60346241d186f.pdf
    • http://xoriruviridov.22web.org/xewerobufafiwu.pdf
    • https://vanixegufewip.weebly.com/uploads/1/3/4/5/134511125/zafinujiw.pdf
    • https://cdn.sqhk.co/vipabure/jecnjgU/ge_bluetooth_smart_switch_smartthings.pdf
    • https://cdn-cms.f-static.net/uploads/4486367/normal_6047d34db5283.pdf
    • https://sotokogel.weebly.com/uploads/1/3/4/2/134266154/3500343.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nunakixuma/candy_crush_saga_game_for_mobile.pdf
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_f76c730dd1914779b68665d30b12b530.pdf?index=true
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_fa3381982da74a788a6438b6c08f75f0.pdf?index=true
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_a40fac0641674fc198b8c7652cbf013e.pdf?index=true
    • https://s3.amazonaws.com/jiguwuzobozobaz/panerorijizijorexi.pdf
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_ace5806abc0846bf871cada6fecc151e.pdf?index=true
    • https://148d48ef-a78d-4e34-a4d2-755cfbac042a.filesusr.com/ugd/ccca9b_cd24abe45a084c16be6ebdf74cc6f112.pdf?index=true
    • https://s3.amazonaws.com/perurulexi/vibow.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_off0000f130.bin
a90dd32c5d62ab0d0924206c0062450c38176e108b8cf4619ec179dbb8a39183		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 5300 bytes
font_01_sfnt_off00010337.bin
8cedbde98f157bf725f1d5e370088057717834f6c750c404da18bfaeb2e9c10b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 10492 bytes

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