Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19237785694f9e1…

MALICIOUS

PDF

85.5 KB Created: 2021-06-04 00:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 315c26cb6dbf2ddf44bad5177a453802 SHA-1: ada0ebc57ac91a669e0ab946e90420b978445b5a SHA-256: b19237785694f9e1439768f159a551bdbb4fd7a909dbba39a14084b873c08402
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ML classification and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a legitimate resource while masking its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8968

Heuristics 5

  • 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
  • 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://pixomot.ru/pbw?utm_term=minna+no+nihongo+1+version+1+-+reading%252F+grammar+practice PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366319/normal_5fed1dee4188e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5fcd78d17a908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_60522008d76e4.pdfIn PDF document text
    • https://lipanoragufa.weebly.com/uploads/1/3/4/4/134489679/6740541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489056/normal_60b87386e5cd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489992/normal_604dbd0557ea6.pdfIn PDF document text
    • https://muxosafexokole.weebly.com/uploads/1/3/4/4/134485240/8f580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401985/normal_600522b2752d1.pdfIn PDF document text
    • https://zepemebawu.weebly.com/uploads/1/3/7/4/137499293/1690e434705d89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_6056f3b655ce4.pdfIn PDF document text
    • https://tevuratoza.weebly.com/uploads/1/3/4/0/134019225/6840349.pdfIn PDF document text
    • https://jugotazotezolut.weebly.com/uploads/1/3/5/9/135973864/269075.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4482858/normal_60b63d46c42ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_6010d4ef04248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_601a661faac6c.pdfIn PDF document text
    • https://rabofabi.weebly.com/uploads/1/3/0/8/130813834/e9d48a84da9b.pdfIn PDF document text
    • https://xofanasafavusov.weebly.com/uploads/1/3/4/3/134399160/jugevedozitu.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/3ea2e525-9b81-4d69-9ca0-aa0bb83bd942/74436402194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/969112c6-ab02-4c3d-bd4b-e7e0c10b199a/zogelarasufijebefosanexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a5a8c14-2fd7-4c34-854f-434e056d8e61/40852450876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766aa6a6-ff91-4479-b7cc-fe3d48e3b59e/scientific_names_of_fruits_and_vegetables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168bbd8a-cf70-4bad-9766-8e6af6abd437/what_is_bank_address_for_wire_transfer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0467223c-d562-428c-934b-680756cfdb1c/98904115634.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 5428 bytes
SHA-256: 6108cd927aa69f350fa347bc932540af828c8228d747fd4ce0eccf2a45f06280

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