Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa36e98eecb0ca01…

MALICIOUS

PDF

75.0 KB Created: 2021-05-29 21:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 86dd8628535ee751c43f846cc5ca4b4d SHA-1: 8c65fe4515b5b86a503abe7cc6d28fe84f36af70 SHA-256: fa36e98eecb0ca013f3cf858431d6eef0a9f1c582b852d49430f5330265fb8a1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, and ClamAV detection as Pdf.Phishing.Trojan suggests malicious intent. The embedded URL and the document body text, though garbled, hint at a lure related to file conversion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://maypoin.ru/123?utm_term=convert+pdf+into+spreadsheet+excel PDF link annotation
    • https://posoxoniboje.weebly.com/uploads/1/3/4/7/134713430/1532f216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_6065a131d8d8f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387571/normal_60b002d7e9e3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_605556c37f9aa.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/kazaz-darufolegu-fufosomato.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494648/normal_5ffae9d8ce114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486035/normal_602a22acab67d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472198/normal_605913b8318cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501645/normal_5fcdaf3ebb705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_600b61881f5f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5ff2e3a4806b0.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/1a654782-b9cd-4356-b53a-21d774c8d027/17222027776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc34cfe-faac-48fc-b8fe-31798167df58/wegesukosotosuvezewama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5857177-f802-466d-b8ac-72801e7558fe/any_words_that_start_with_zen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8238d1d-113f-4132-917d-ff547ddb8dcd/53689651645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9910fd2-ac72-466a-870b-422ad79b699d/peter_kreeft_argument_from_desire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66fed77-7127-42c8-b574-30c7fc0f4d59/77050409568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b76b25-c328-436a-a8c5-5e0116feff6c/what_are_the_five_elements_of_critical_thinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ea20e3-6ded-4240-a1d8-cb9ebb28b4de/native_american_literature_course_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0202325-b373-40d2-97ed-c8b3c068abf1/ejercicios_diptongos_e_hiatos_5_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001f9fb3-cf3a-4791-9d43-92d8216753c6/medieval_period_of_indian_history_stretches_from_the.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_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 5276 bytes
SHA-256: 08255ee366ea17c8818d600ca346d19f956a8c68ee32b443bfff7269ea37c544
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 10940 bytes
SHA-256: 07f24cf19bd642888cca566c21e1ad9ed6b3132d5d63ce092bebe26552c00e47

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