Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6482029e44ddf5…

MALICIOUS

PDF

84.8 KB Created: 2021-03-15 07:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e1d2a179c1e43dac1b337fdc7ba2198a SHA-1: 1fb7f5f36bafdff34d45597e98887796d2ca3068 SHA-256: 9e6482029e44ddf5c680d70cae5ae91930da1996d2ce9266c7adaf239c79e5b7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating it functions as a link farm. One of the primary URLs observed is https://druttle.ru/strik?utm_term=rebel+xti+lens+type, which is likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and link farm heuristic suggest an attempt to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=rebel+xti+lens+type PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445101/normal_6030639844b55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452193/normal_603071d868417.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465388/normal_5fd07f4d8eb32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fedea576f1b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_5fca6471788f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_acacfc07d64b462d9d9c89d328650d0b.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_eb85fd22e0014ebfae8fd470a36d6537.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_6f017418396d4850b11078dc2b00a2a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4637ba-0b08-4393-9c12-bf2cb75fcde7/99917769847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52bf7b11-2f6b-4a80-a23a-aa7bbed89f4a/benekekalunumasimitalor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d33427-60df-40a8-8f41-ce2097b34438/sakigefifovatatud.pdfIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_f4c0ca08a0cc41aab7aed39ef7596549.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/42269616046.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/53242960338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a99deb-e610-4124-b2ca-e9de82f36833/wusigo.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/chocolate_movie_filmywap.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_c44951d28d50412499f1ea484b02a2a8.pdf?index=trueIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_5417b41cb66e48d78cb8d0126b17a70e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/ease_of_doing_business_2019_report.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_3729a6457dbc4b2f9a8fa50c4db73cb1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c737f64c-4972-41f5-a7fb-311be14966b3/34397750339.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_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 4824 bytes
SHA-256: 4dd7dceecd398ae1b0ce45bcc1b04df118b42b49de84852c7bdb4adaf34da49c
font_01_sfnt_off000110e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 22752 bytes
SHA-256: 3efcaaf89ef15e4546fb3d619d6a90196254cb3fe359a806b8ab4824eb48dc6d