Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b86d936b664985d…

MALICIOUS

PDF

72.6 KB Created: 2021-03-15 07:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 90044aed90f0a160ec3ae7c238f3a376 SHA-1: bd2e1e3d87c95484a229e9259418f041755d829e SHA-256: 0b86d936b664985d48c130545361248bbff66727dac3bfe64eb69e87dee957a8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, indicating it functions as a link farm designed to redirect users to potentially malicious websites. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ClamAV detection and ML classifier further support its classification as malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://ponafet.ru/award?keyword=saqueando+o+inferno+pdf PDF link annotation
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/de976.pdfIn PDF document text
    • https://puliwive.weebly.com/uploads/1/3/4/6/134660228/bdac0e964c3.pdfIn PDF document text
    • https://viwitilabepimep.weebly.com/uploads/1/3/2/6/132695477/basiwirelijepuniwud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_603261e558677.pdfIn PDF document text
    • https://kajugomurabamuj.weebly.com/uploads/1/3/0/8/130814292/pevip-jewibun-sujen-baginarafus.pdfIn PDF document text
    • http://sudedelanefozuk.66ghz.com/juzisofonagero.pdfIn PDF document text
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/2961378.pdfIn PDF document text
    • https://nufawufaza.weebly.com/uploads/1/3/0/7/130740177/a8eb4c5c4aeea6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373517/normal_5fc69c7ae595e.pdfIn PDF document text
    • https://retezuve.weebly.com/uploads/1/3/2/7/132741149/76c8878.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/kutozafefebog-nujewubude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_604dd24a39114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_6019d59b29d70.pdfIn PDF document text
    • https://rixukiwifezi.weebly.com/uploads/1/3/5/3/135392959/zagegugekoroz.pdfIn PDF document text
    • https://kilobabax.weebly.com/uploads/1/3/1/8/131856311/begiku-gagemaxajoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495838/normal_5fe9db1c34103.pdfIn PDF document text
    • https://tefuvaxijo.weebly.com/uploads/1/3/0/7/130739162/wojonobo-guworog-xadubew.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/mikufoninuzezivezebo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dceb8bc1-075c-41ad-9284-6851816485d8/what_happens_if_you_fail_visual_field_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d13259ed-a3b1-46fb-9b8e-eff6cd1cf6fb/sufivumawatinatixorerosok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa29080-de48-4917-877d-286fef91d600/40344896956.pdfIn PDF document text
    • http://viputuv.rf.gd/homelite_leaf_blower_carb.pdfIn PDF document text
    • http://ludujefu.epizy.com/present_perfect_simple_exercises_esl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ed5716f-6e62-406b-b4b7-a0a4bca53ea0/amazon_wheel_of_time_book_13.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD952 5056 bytes
SHA-256: 9a5091251c99b23a449ab08f1bc2199b957641f65ab1acf486b5c641b3d39d9e
font_01_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 13128 bytes
SHA-256: e79d5abbaf8fb06bfdc3517e25ddb6283ac093ad31c63cc22692d36b32abb8c1