Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20b9c030a62b962…

MALICIOUS

PDF

77.6 KB Created: 2021-03-15 11:09:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ddac1224c819801d4eb9fd752a73c1e9 SHA-1: df04a42a9243359997ef3730476f7b2252c9abd9 SHA-256: b20b9c030a62b962dc9e3b09aaaf74a2e25b412209b2098cdd0210f6bf6d3bad
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm containing numerous external URLs, with a high ML classifier score and ClamAV detection indicating malicious intent. The primary URL, https://mezovuduw.ru/award?keyword=consonant+blends+exercises+pdf, suggests a lure to disguise the malicious nature of the document. The presence of embedded JavaScript, though not directly analyzed for specific actions, is often used in PDFs to facilitate malicious redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=consonant+blends+exercises+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471706/normal_5ff368b36355e.pdfIn PDF document text
    • https://gewavidabu.weebly.com/uploads/1/3/0/7/130775927/reguju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_5fd6fd0f2ee83.pdfIn PDF document text
    • http://smartcreditcheck.info/how_to_play_diablo_2_lod_in_high_resolution3z6n5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405195/normal_5fc62039d8b94.pdfIn PDF document text
    • https://botosedasirewen.weebly.com/uploads/1/3/5/9/135961685/fawuli_nuxajatazuw_zigam_zidujoxunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_6041eb8651a91.pdfIn PDF document text
    • http://bloomwithdeanna.com/saroririjjls15.pdfIn PDF document text
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/wawakefiretamaboxal.pdfIn PDF document text
    • https://gupebaxederor.weebly.com/uploads/1/3/4/6/134691072/nogavulom_sogase_rirodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529087/normal_5ffb5fc8601b5.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/aa1fd8ca-784f-42df-b20d-7ccf3edb196b/og_mandino_books_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73641327-4403-4479-b72b-1b007f8e80e8/75190415824.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ed10ae-2ac8-416c-9a04-2ed678f0f2c5/84326680478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5135e6-d4ac-4b1c-906e-a0f01c70ada5/66039111494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29476e1-232e-4e82-a370-048ba0198d0a/drawing_for_dummies_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96469de1-a7b7-461d-b1d2-9315dc72f281/onkyo_ht-s3700_review.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_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 5260 bytes
SHA-256: 9f8ee14f682ecf5b7b324b6c2f650aa6c1cccad62ce7fe31130169b87571a719
font_01_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 10908 bytes
SHA-256: 9f7fee39da992bcc6088bf86cf00325b3639e46ad087e122285d0934b97da926

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