Malicious PDF — malware analysis report

Static analysis result for SHA-256 285055c567f509cb…

MALICIOUS

PDF

75.7 KB Created: 2020-12-22 21:52:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 671b4a37a629a2e66e9471baf13c0ea8 SHA-1: 18b1450390b772ce7ae8445324c9415928948292 SHA-256: 285055c567f509cb339d68a5c1dd3c4dd73ad4498b39519c3002cd10a74c366c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF contains a large number of external links, a common tactic for SEO farms or redirecting users. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=ticker+tape+parade+yankees PDF link annotation
    • https://xowanejizaki.weebly.com/uploads/1/3/1/8/131871556/6305520.pdfIn PDF document text
    • https://zefokivovemajo.weebly.com/uploads/1/3/0/8/130874141/joradodos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/aluminium_composite_panel_fixing_details.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57040c30a162e0c711843/t/5fcf242355629615614bef82/1607410725457/fireworks_short-_form_videos_for_pros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d804793-489b-4232-a580-cdaac69047a7/loxasenot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552e23aa-9393-417a-beae-1cecd93cb64a/detoxonoredifegud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db8f330-c135-406e-8060-6a04b672cefc/dancing_ballz_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09b0966-1745-47ac-afef-080dd51cef52/ribusaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d85219-5226-44b1-9b90-4ba24548c176/sipovemogova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a786814-c0c5-4bc2-b363-4bbe56f7a716/gevuzudezi.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/cadillac_xts_2016_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f678c860-c8c8-4caa-9dfd-149d85ce22ff/math_kangaroo_2016_questions_level_3_and_4.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_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 5152 bytes
SHA-256: edc25bf07567460a7cef8b8ea8a7d231d37e977106ac5a70e04e426177f7545c
font_01_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 12556 bytes
SHA-256: 6c725d03082f801eb8909926097e84941b3c97112ae04223203dd5a0d43efd2b

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