Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6abde774f21701e…

MALICIOUS

PDF

74.1 KB Created: 2021-05-29 07:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 25b92d6381b37c23c7d1a8aadf4536b7 SHA-1: 7de50b469c7a67de4a5df24a7d8b329f023250f6 SHA-256: b6abde774f21701ebd6fc9a084f5c0f0c784a1d457047c98cee9bb45f0cfead2
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary malicious URL, 'https://yafferge.ru/strik?utm_term=volume+of+pyramids+and+cones+worksheet+answers', is likely used to redirect users to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'Volume of pyramids and cones worksheet answers'. The presence of multiple external PDF links further supports the link farm classification.

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
  • 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.
  • 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://yafferge.ru/strik?utm_term=volume+of+pyramids+and+cones+worksheet+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4447278/normal_5feba0701a28f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4485310/normal_60b1baa9e984e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_603af58a159d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408701/normal_6057a60b03497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_605c379f8f090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_5fd79f462f069.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_5fcf6e8a4550e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_6025c45b12f42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_6032a7150640c.pdfIn PDF document text
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/4803d8a813374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494138/normal_603ad0e24ead7.pdfIn PDF document text
    • https://sotufipepu.weebly.com/uploads/1/3/4/5/134595957/rebezaku_jefubiboz_fenizesuweg_gevufumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_605f2ceeaf8a8.pdfIn PDF document text
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/xuzune_kofagamim_laguse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488103/normal_6002ec83782e5.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/eccbd455-52c6-4bb5-9cee-c3e4f6e6ba8a/tumodasovefilowuzefavaban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f534339-2ddd-499d-bf1a-7dcd00f6ce01/7950615786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611352d8-8009-4ef4-86fd-ea8b80db326c/the_way_of_the_superior_man_by_david_deida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6f736d-4232-435e-bf80-9ce3edd3689a/discipline_equals_freedom_summary_reddit.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_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 5616 bytes
SHA-256: cd4bfcde0758d6360b88bf0adfbfeb548904c299c8502eff46f66d913b917ff9
font_01_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 10660 bytes
SHA-256: e5d9dd43e70f44b5299c77a4684c45641ce3d8babc207440c2a1118d837a772c

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