Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa61b4ee3758eaa…

MALICIOUS

PDF

86.8 KB Created: 2021-03-22 20:07:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eb6ffb46291b3aaa7e250822f186d60 SHA-1: 0886e832234e04486032dc44e32df73a05deafed SHA-256: 3aa61b4ee3758eaa7fdb4f18e403021036b8993a16f10c15c12a030909815d53
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 of which point to SEO-optimized PDF documents, indicating a link farm designed to attract traffic. The primary URL, https://jumiwimov.ru/strik, is likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://jumiwimov.ru/strik?utm_term=what+happens+when+you+focus+on+one+thing
    • https://cdn-cms.f-static.net/uploads/4467601/normal_601f043eb7bde.pdf
    • https://cdn-cms.f-static.net/uploads/4378386/normal_6031bbbecc1d9.pdf
    • https://cdn.sqhk.co/lewulula/hSniege/clash_of_clans_private_server_android_1.pdf
    • https://cdn-cms.f-static.net/uploads/4465914/normal_605257812031f.pdf
    • https://pagopolekabob.weebly.com/uploads/1/3/4/3/134305888/d21caa5072dd40.pdf
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdf
    • https://cdn-cms.f-static.net/uploads/4471240/normal_5fe7a63748bd2.pdf
    • https://cdn-cms.f-static.net/uploads/4455898/normal_6056b975c959d.pdf
    • https://fumozowafujazuv.weebly.com/uploads/1/3/5/3/135331302/b4e8897acdbc964.pdf
    • https://cdn.sqhk.co/wevafofed/RFOhhij/vampires_vs_the_bronx_cast_gloria.pdf
    • https://cdn-cms.f-static.net/uploads/4422640/normal_600c6ae238709.pdf
    • https://cdn-cms.f-static.net/uploads/4387929/normal_601c6c87dbf37.pdf
    • https://rusunesezov.weebly.com/uploads/1/3/4/3/134309606/jemazosinobasixotu.pdf
    • https://cdn.sqhk.co/mivoteloxip/xgejfWa/darokawojonuveronorupegik.pdf
    • https://xuvesebitewetok.weebly.com/uploads/1/3/6/0/136086761/mixid_betibakaxuwix_tafir_zorumekuziv.pdf
    • https://cdn.sqhk.co/kawonidoza/jatvijn/wilegumilavewa.pdf
    • https://cdn-cms.f-static.net/uploads/4491159/normal_603425637a94e.pdf
    • https://cdn-cms.f-static.net/uploads/4501046/normal_604d3582a2396.pdf
    • https://static.s123-cdn-static.com/uploads/4484623/normal_5ff6107a8fd88.pdf
    • https://sivitudogadix.weebly.com/uploads/1/3/4/1/134108631/guxeviguvikowenufos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jefobexapulow/pediatric_hemolytic_anemia.pdf
    • https://s3.amazonaws.com/tinezedu/17399208153.pdf
    • https://s3.amazonaws.com/pajeriramal/how_to_make_emails_bounce_back_to_sender.pdf
    • https://s3.amazonaws.com/pasutiz/30797864926.pdf
    • https://s3.amazonaws.com/rorives/decode_base64_to_angularjs.pdf
    • https://s3.amazonaws.com/pexodugosa/39670991185.pdf
    • https://s3.amazonaws.com/padanivozeb/laxureji.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/dazeder.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_off000113b4.bin
3f8ab45d7acf109b5944a41a325d295adbdf94cc500febbc45da83e39f23f322
pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 5356 bytes
font_01_sfnt_off00012616.bin
9cbde3e715fcf7078ccfb5051141331be7ef6dba8467419118e321076e2f331f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 11056 bytes