Malicious PDF — malware analysis report

Static analysis result for SHA-256 be162ded8b4e94c2…

MALICIOUS

PDF

82.0 KB Created: 2021-05-29 18:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9c4a494ab56d3a02b4cc696135c73b7 SHA-1: ce3c3d367fdfe3c042371c630ee9a32a6b6139d5 SHA-256: be162ded8b4e94c2701305d626083d9864b45ade1f69203896b09f40d4b2494b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document body and embedded URLs suggest a lure related to software keygens, specifically Autodesk AutoCAD 2017. The PDF contains a large number of external links, indicating a link farm designed to obscure the ultimate destination, which is likely malicious. No scripts were extracted, but the presence of external links and the nature of the lure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/123?utm_term=autodesk+autocad+2017+keygen+free
    • https://wutosalix.weebly.com/uploads/1/3/4/6/134635680/bedakebisov_tijumidive_vasafibun_vomeriba.pdf
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/ferowatoje.pdf
    • https://lowalijadu.weebly.com/uploads/1/3/4/8/134866304/xizakodugula.pdf
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/34521a6.pdf
    • https://zejewovelopitut.weebly.com/uploads/1/3/0/8/130813539/kagen-dikiralitogig.pdf
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/bomoviguzagon_ziwusa.pdf
    • https://rifatusozoked.weebly.com/uploads/1/3/2/6/132681337/9620c5e757.pdf
    • https://juleladenoduko.weebly.com/uploads/1/3/4/4/134478401/8a4f6d46.pdf
    • https://pujofolowax.weebly.com/uploads/1/3/4/6/134669504/2ccfba3a856d0dc.pdf
    • https://xozilozevaloda.weebly.com/uploads/1/3/5/3/135391373/bizotubavipetumot.pdf
    • http://bytlly.com/17eqke
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1b102ab2-696e-4895-a3d1-724dc575f1bc/13691922182.pdf
    • https://uploads.strikinglycdn.com/files/bffa875f-5a3b-4c4b-a791-95cb641e9621/mixuxi.pdf
    • https://uploads.strikinglycdn.com/files/cf9b4130-8aa4-42cd-b573-f2efece851e6/ninpiden_english.pdf
    • https://uploads.strikinglycdn.com/files/6ee8c70a-30e9-455d-9cc0-473598c10e08/roterugafawavike.pdf
    • https://uploads.strikinglycdn.com/files/f104dd4f-1909-4c2f-96a6-7fbe480defa1/how_to_set_philips_wake_up_light_hf3500.pdf
    • https://uploads.strikinglycdn.com/files/bbfc4ab5-dd21-4516-9cac-421e3448c4ad/automatic_control_systems_9th_edition_trke.pdf
    • https://uploads.strikinglycdn.com/files/ec5ecf62-7c61-4eba-9388-f6b2636be8aa/princess_bride_game_free_online_play.pdf
    • https://uploads.strikinglycdn.com/files/ff2c5883-a3c8-4f8e-aecd-4d8cddd6b15e/28572492803.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec73.bin
879be795bbd8554e696a407cb32387a01d97fe106222b469fc54d58d6c059fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 5732 bytes
font_01_sfnt_off0001000b.bin
40248b013303d5958d71d37ae9bdc249534c9285bf834838de3a38d6d70013d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 5716 bytes
font_02_sfnt_off000113b2.bin
36ee3434293eddcf678142718f156b0d2ef1473a9014db1df9b58ba196f2fe7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 11252 bytes

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