Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a136340db7622b…

MALICIOUS

PDF

65.3 KB Created: 2020-12-10 19:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3f2b2cc57791afa21910316a41199363 SHA-1: bbee7a751aa51b0aae01aa2e5e64b25b5d448df2 SHA-256: 21a136340db7622b628390df3257fb7151e1458459d353156b6bd93547eeb00a
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 heuristics indicating it is a malicious phishing document. It embeds external links, with one prominent URL leading to a site promising game codes, suggesting a scam. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure.

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://trafffe.ru/strik?utm_term=town+of+salem+codes+for+coins PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403687/normal_5f9288bf4f122.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485818/normal_5fcd0ca01697a.pdfIn PDF document text
    • https://retujesa.weebly.com/uploads/1/3/4/5/134529196/zidiwakep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408704/normal_5fcbd75912566.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/pojidimuxe.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/315d2bee-675f-4f89-a21e-46b3870c077a/pumazepigumizimuritumasab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fdc816b-325d-4a29-b821-40a73c236683/craigslist_syracuse_ny_cars_for_sale_by_owner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae0a25f-6415-4369-9e67-1731b7350f04/sanudivexabedujufawipuxaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c261c16e-10a8-4902-b28e-f955ebfa0bc4/fixoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63cfb131-2284-4339-893d-2121d181231d/17767488830.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc295c5a5bc066edfb0618a/t/5fc397969b1ed035384b7fc0/1606653846457/21st_wedding_anniversary_images.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3a01a8ef7301f8b21e4b4/t/5fcc11b074a40730fb87260e/1607209393424/17893790577.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_off0000c3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B6 5208 bytes
SHA-256: cdcbf7a53730e65a034490f44d2688c4c95c87ba3d59288db24f6205d5c6acc5
font_01_sfnt_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 10468 bytes
SHA-256: 77f082ffc4c6ee25d7edd1521855fed26710b5f6c1901b6a1660020c3636a6aa

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