Malicious PDF — malware analysis report

Static analysis result for SHA-256 556569a183d480f0…

MALICIOUS

PDF

66.9 KB Created: 2020-11-19 21:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e65844e1b892a82a6bbd932114bcbb36 SHA-1: d3c0469ea81a309b0b3391d359e4017d2d45dc1c SHA-256: 556569a183d480f0861d07713607be3418169d0223afc4a3906b62dd44a2297a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary external URL points to a domain associated with malicious activity. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior strongly suggest an intent to redirect users to malicious sites.

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/aws?utm_term=rustoleum+cabinet+transformations+linen+vs+pure+white PDF link annotation
    • https://dirojobadenanew.weebly.com/uploads/1/3/4/1/134109317/2628073.pdfIn PDF document text
    • https://refaxezadale.weebly.com/uploads/1/3/4/3/134325555/e95e224c8f2d.pdfIn PDF document text
    • https://duvonejubuzal.weebly.com/uploads/1/3/4/3/134321315/bidiva-tawen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414860/normal_5fb309f95010b.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/7cfb6ea6-e55c-4c30-b945-25e083c5ae53/Az_ari_por_no_indr_Atlye.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79da91d5-61ac-4aeb-9c6e-52bba8612fd3/jovulapoduvonuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b021cb-bcd5-4e98-b92b-9b249da3739e/34920150316.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/sports_illustrated_swimsuit_2020_man.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c87b2a8-118b-4bb9-a12d-a45000bf1d98/manumuwutosesokanoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901c05f2-680b-4811-af01-8d0345964eda/75077094957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d28d1f-73bc-465b-a787-e8825b615bb8/bio_bidet_elite_3_video.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_off0000c7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 5556 bytes
SHA-256: e61e13542e3b2d49f7d9d3d02181e56797802a6e08f7ed817ac0d7d47d0e04bb
font_01_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 10652 bytes
SHA-256: 4a6f4792377ee3e3fcf7c5ed3e11ca093babd159e55423c1325bb37505623fc3

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