Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90be35c835fde97…

MALICIOUS

PDF

76.7 KB Created: 2021-03-30 00:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7a231ee85871fcc20c11e2ebd49f755 SHA-1: 31fee7473487e42c63632768d06bf477741600c9 SHA-256: c90be35c835fde9713dca1a3921004faa27d533779270a2e82d799f6fcd6a5ee
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, including suspicious domains like vilenefex.ru and wogivodugakovek.mygamesonline.org. The document's content, disguised as a guide, is a pretext to encourage clicks on these links, which likely lead to further malicious payloads or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://vilenefex.ru/strik?utm_term=how+to+set+my+heating+thermostat
    • http://wogivodugakovek.mygamesonline.org/warhammer_betrayer.pdf
    • http://vesajob.getenjoyment.net/debimapifepufu.pdf
    • https://zotapuzuvekef.weebly.com/uploads/1/3/4/3/134323554/a4145832dc4.pdf
    • https://gibawimeviz.weebly.com/uploads/1/3/5/3/135348906/6008192.pdf
    • https://cdn-cms.f-static.net/uploads/4457305/normal_6039dd038b67a.pdf
    • https://pakosikan.weebly.com/uploads/1/3/0/7/130740558/1279.pdf
    • https://sifukimoja.weebly.com/uploads/1/3/4/3/134357082/tojixumixile.pdf
    • https://fuvukajewub.weebly.com/uploads/1/3/3/9/133999399/90d69d.pdf
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/bodivet-puravifirika-nisebelamave.pdf
    • https://cdn-cms.f-static.net/uploads/4374968/normal_602972fba6e54.pdf
    • http://kuzexamipapoxip.medianewsonline.com/42860459625.pdf
    • https://fugebigejajifad.weebly.com/uploads/1/3/1/4/131406613/465d0b07f601.pdf
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/vubikilu.pdf
    • https://static.s123-cdn-static.com/uploads/4374360/normal_5feafe559bfdd.pdf
    • https://bivofeneduwid.weebly.com/uploads/1/3/1/1/131163561/kowibejivijezogitevo.pdf
    • https://fadexawotizetav.weebly.com/uploads/1/3/4/3/134339615/jebexiri-vajakanu-bijosewakube-xejeviseju.pdf
    • https://rakatifuz.weebly.com/uploads/1/3/5/9/135964199/bobitet.pdf
    • https://cdn-cms.f-static.net/uploads/4426688/normal_60199e379fd02.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mifotabelimudon.myartsonline.com/convert_to_word_arabic_language_online.pdf
    • https://uploads.strikinglycdn.com/files/5d858fb3-048c-4681-a739-e7e8a666a9e4/lolel.pdf
    • https://uploads.strikinglycdn.com/files/9dcd1a56-2b9c-4f1c-815d-a01f35c54a49/machine_learning_matlab_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/c5e60690-b85f-468d-b10d-6b9ad74d0349/72539070603.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_off0000ed91.bin
451ee2ada4c896dcfd2fc7b0ef8b15f7541c3b8f079d4858d0813b9d4c9204f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 5224 bytes
font_01_sfnt_off0000ff3f.bin
1b39388211ace5cccb2ee201841dd2c686bfc2f0b41e308bf406c4310d1e9af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 11236 bytes

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