Malicious PDF — malware analysis report

Static analysis result for SHA-256 d392c2f3fac04745…

MALICIOUS

PDF

84.5 KB Created: 2021-05-29 19:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8411c52e867b819feb943137caf5220 SHA-1: 7f09c4a863c48c2833e753bbb4b99a796592469f SHA-256: d392c2f3fac047453d73b0d03cfeb624d1bd71fa8d413e206e6e257bc5474244
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm, with one prominent URL pointing to a site that appears to be a lure for search engine optimization. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external links and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://fokemale.ru/wb?keyword=youtube%20how%20to%20program%20defiant%20timer
    • https://cdn-cms.f-static.net/uploads/4483873/normal_6037ccc2cb543.pdf
    • https://cdn-cms.f-static.net/uploads/4455374/normal_603e2c626f473.pdf
    • https://static.s123-cdn-static-d.com/uploads/4393514/normal_60b0ce2b73856.pdf
    • https://static.s123-cdn-static.com/uploads/4462714/normal_6005603b8b07c.pdf
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5ffed0837030d.pdf
    • https://cdn-cms.f-static.net/uploads/4456387/normal_60449f3ee5ede.pdf
    • https://cdn-cms.f-static.net/uploads/4489839/normal_5fd666268ac97.pdf
    • https://cdn-cms.f-static.net/uploads/4483589/normal_600bd0519ecbd.pdf
    • https://wolixakeju.weebly.com/uploads/1/3/6/0/136002716/tedosisoraki-vibigetobu-xuxenigo-mewozoguwem.pdf
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/3680901.pdf
    • https://static.s123-cdn-static.com/uploads/4391302/normal_5fc733c89a9b7.pdf
    • https://static.s123-cdn-static.com/uploads/4369503/normal_60098605dcf44.pdf
    • https://purolakesis.weebly.com/uploads/1/3/4/5/134588460/moripaki.pdf
    • https://cdn-cms.f-static.net/uploads/4377380/normal_6023c3f5c337f.pdf
    • https://cdn-cms.f-static.net/uploads/4379736/normal_6011b60633b19.pdf
    • https://static.s123-cdn-static.com/uploads/4445118/normal_5fe33d5bc438e.pdf
    • https://cdn-cms.f-static.net/uploads/4388271/normal_602ff28139eac.pdf
    • https://cdn-cms.f-static.net/uploads/4459034/normal_604fbe8eba87b.pdf
    • https://cdn-cms.f-static.net/uploads/4461483/normal_606e46f21cb17.pdf
    • https://cdn-cms.f-static.net/uploads/4474985/normal_604b58fee5878.pdf
    • https://deperomider.weebly.com/uploads/1/3/4/3/134344929/tugubufolojovana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0223179e-507e-400f-be82-5f2f83307545/how_to_pair_jvc_bluetooth_headphones_ha-fx9bt.pdf
    • https://uploads.strikinglycdn.com/files/52ca3e31-79a5-46e2-9784-c1c43efd69b7/6805833803.pdf
    • https://uploads.strikinglycdn.com/files/ee2d3f7c-9e99-402e-bb9a-2eb80c7d90fd/genizubomurirotat.pdf
    • https://uploads.strikinglycdn.com/files/3af27e3e-4f33-489c-8817-9e64f189297c/what_opera_is_the_song_nessun_dorma_from.pdf
    • https://uploads.strikinglycdn.com/files/dc9003cf-a05e-43e3-8351-590d4c276296/xovuzagerizazaz.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
    • 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_off0000f1f4.bin
50e32f31c59d41688644de0374d93e155daf6d116e57c8a7244c6598e9501e48
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 5440 bytes
font_01_sfnt_off0001045b.bin
85af81b1504e1dc6bf5d81f7733d8d4f885ad64ca86bd4aca6ed344fd737e783
pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 12392 bytes
font_02_sfnt_off00012d20.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D20 16092 bytes