Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3e1c6f536b1179…

MALICIOUS

PDF

75.4 KB Created: 2021-02-17 11:02:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 03ae06ef1a8f873d44f5bc218b7f5658 SHA-1: da43d882be4b94b0e28a5a6aa22560d0f87821ac SHA-256: fa3e1c6f536b117994c5c2795fa11b13865679594bf07e51399698a560568a74
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, characteristic of a link farm. One of the embedded URLs, 'https://leonvi.ru/aws?utm_term=why+isn%2527t+my+dell+pen+working', and another related to a PDF link farm, 'https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/taxujelizu.pdf', are flagged as suspicious. The presence of PDF-specific heuristics and the ClamAV detection name 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' suggest a phishing or trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/aws?utm_term=why+isn%2527t+my+dell+pen+working PDF link annotation
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/taxujelizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_602ab57149e1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496148/normal_5fe6278027d79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416316/normal_6003c2f4052a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416500/normal_5fe0e2efa21cd.pdfIn PDF document text
    • https://lalojitewimagix.weebly.com/uploads/1/3/5/3/135304200/038660a0539.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5fe08dce71218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391920/normal_5fcd5a27e5b27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371514/normal_6000ca6eb9a4a.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/tirudirinil.pdfIn PDF document text
    • http://pobasomitiji.22web.org/78835914535.pdfIn PDF document text
    • https://jitezawedum.weebly.com/uploads/1/3/4/6/134688152/ff5a22219646ff.pdfIn PDF document text
    • http://copyrighthelpcentral.com/tor_browser_linux_githubkdewv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujitajaxo.epizy.com/gegisoladotuxinapasinu.pdfIn PDF document text
    • http://goxakimolo.epizy.com/democracy_is_better_than_dictatorship.pdfIn PDF document text
    • http://reluwiz.epizy.com/77705695037.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_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 5468 bytes
SHA-256: f533ed6606664797acfdf97e302012962b840ca7a86171127d50d0dfeee37d12
font_01_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 11152 bytes
SHA-256: 5aa6978e3e1fc5ac9112e3dc88821b8327af48b91226751771bde96ecc3e407b

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