Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1aa236c78aa9227…

MALICIOUS

PDF

81.3 KB Created: 2021-03-15 16:07:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76bf2b6045ca3f3ce436cbb2135923ea SHA-1: d29643fb6ea4032903aab51b943711faa1d7eb6e SHA-256: f1aa236c78aa9227e6f9fd0be1b342eaa7c6d4cd48e9921e185e6d673818b194
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://resalured.ru/award?keyword=angularjs+2.+0+tutorial+pdf
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/7276902.pdf
    • https://static.s123-cdn-static.com/uploads/4426063/normal_5fe5893dbdb3a.pdf
    • https://sesesisemiv.weebly.com/uploads/1/3/4/7/134746737/febbbd12d5.pdf
    • https://static.s123-cdn-static.com/uploads/4454999/normal_60065b3854a71.pdf
    • https://lakofanagobogan.weebly.com/uploads/1/3/5/3/135386994/7188155.pdf
    • https://static.s123-cdn-static.com/uploads/4382790/normal_6008fcb9edcf6.pdf
    • https://cdn-cms.f-static.net/uploads/4369665/normal_6027d4b9c3db3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/94bb11c8-62b5-432e-8205-177fb3700744/vosak.pdf
    • https://73808e0e-d5df-4584-b63e-1552d949bc0c.filesusr.com/ugd/8d2ea6_1cf7b80690e1457fbd48066e9a444af3.pdf?index=true
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_6c2e0eae54174061b6c411ccbe519bb9.pdf?index=true
    • https://s3.amazonaws.com/jinabom/25869118155.pdf
    • https://s3.amazonaws.com/bidemewufa/28640582836.pdf
    • https://s3.amazonaws.com/lokijuronig/roxinonewekibizapufezenu.pdf
    • https://uploads.strikinglycdn.com/files/aeb1d03f-002f-4033-9c54-1b0adb48c565/lariladorafubopuwat.pdf
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_769550be4bc249cfa9e6bbef4fad288a.pdf?index=true
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_09b845ed29c84326917d5cb23ac42fec.pdf?index=true
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_41799cd66db34c3bb239e836665811c3.pdf?index=true
    • https://s3.amazonaws.com/mejawiwomak/gagexukasuluzixogan.pdf
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_0fbbfde48ea64656be485598788af626.pdf?index=true
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_e38b86c401b449b6aff5ca4ebc7abb5a.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef32.bin
3e722116fed7094b079b033a3aa777adc003240ca9a2cc61bd2dc6a3cb229a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 5344 bytes
font_01_sfnt_off00010166.bin
180254405ac8c6cc0a84403274f33617554e76050d7cc9d4a44fb6338385c96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 11788 bytes
font_02_sfnt_off00012964.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 4324 bytes

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