Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b54c1dc445dd288…

MALICIOUS

PDF

73.3 KB Created: 2020-12-22 04:35:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf8b0cc7a311589a616a0026576390c0 SHA-1: 7287ee1fd973aa07ac579e56e8a9eb23d6a941fd SHA-256: 3b54c1dc445dd2886230d6842011c4a622fe364160a373e1b744abedd8493901
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. This suggests the document is designed to lure users to malicious websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=anemia+falciforme+e+esplenomegalia
    • https://static.s123-cdn-static.com/uploads/4415073/normal_5fdfbb66b69db.pdf
    • https://cdn-cms.f-static.net/uploads/4392871/normal_5fa1994a98efd.pdf
    • https://cdn-cms.f-static.net/uploads/4425235/normal_5faf375cdbf17.pdf
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5fb8802cbb807.pdf
    • https://static.s123-cdn-static.com/uploads/4417205/normal_5fcf8129f3449.pdf
    • https://mafogidafefuzu.weebly.com/uploads/1/3/4/3/134334422/jiwom.pdf
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/gigofitutixisoxopa.pdf
    • https://cdn-cms.f-static.net/uploads/4421038/normal_5f9e8457d9fc0.pdf
    • https://cdn-cms.f-static.net/uploads/4369158/normal_5f9f08fed1049.pdf
    • https://cdn-cms.f-static.net/uploads/4384046/normal_5f98c00d8d564.pdf
    • https://static.s123-cdn-static.com/uploads/4505326/normal_5fc8f8b0bffb3.pdf
    • https://cdn-cms.f-static.net/uploads/4412757/normal_5fdb9afc7225a.pdf
    • https://cdn-cms.f-static.net/uploads/4426960/normal_5fd62b87d692a.pdf
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f999c93d189e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/08dcb74a-754e-49a8-b19b-1669cc59800a/dark_souls_knights_honor_wikidot.pdf
    • https://uploads.strikinglycdn.com/files/3a538106-7c53-40a4-9bcc-6248d42ed15e/zuzuwozafekutu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e292.bin
929fdcc02ab505b3ed64d582fb30b4aa02de2318b62f4942f68a7d1124ba220c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 5324 bytes
font_01_sfnt_off0000f497.bin
99c57e20877ae0e4fbd1b81ea6a6209fc7191a68375b00d79bf17a5b44154216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 9976 bytes

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