Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af3bc291af5a39f…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 18:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 47eca851d99c2a7b167ac3abbdba35ce SHA-1: 446ca4640716af8aa663d29058f40ba6e78469d1 SHA-256: 5af3bc291af5a39fde87b5baf6025e3b14036144816312c53b4908d57bda3a91
156 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a phishing or SEO spam campaign. It contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL, 'https://jumiwimov.ru/award?keyword=categorical+data+analysis+using+sas+third+edition+pdf', suggests a lure related to academic or technical documents. While no scripts were directly extracted, the PDF structure and the high ML classifier score indicate malicious intent, likely to redirect users to potentially harmful content or facilitate further exploitation.

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
  • 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://jumiwimov.ru/award?keyword=categorical+data+analysis+using+sas+third+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/bozadukopufu/hGSieVg/group_4_model_question_paper_and_answer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_6029d40f7d6f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425919/normal_6034640601da8.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/ejfghu2/uefa_champions_league_2020_liverpool.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5fd970ab01a90.pdfIn PDF document text
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/fd7ab2a.pdfIn PDF document text
    • https://dizegovonaziluz.weebly.com/uploads/1/3/4/8/134881707/tejuxewosozibi.pdfIn PDF document text
    • https://cdn.sqhk.co/pulurune/jdhfji9/xoxejowuregurifupajosoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491148/normal_600da2e051932.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/cGq4Jjy/book_review_the_lost_history_of_christianity.pdfIn PDF document text
    • https://cdn.sqhk.co/kotafuli/x9yjbOO/7395893189.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/57afd2ed-0ba7-4a76-ac9a-c4db481efd66/25932587345.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/52617952636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22686131-7c1c-402f-9186-ce97588a48e2/24746567054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865d96c8-5d2d-434a-8b63-a725dbc49d62/18557852715.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/jepexofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1cd7c8-85d8-4d42-859e-fd2744f64462/how_to_develop_better_public_speaking_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d818a97-5b80-4c64-9263-e78722517302/how_to_check_in_with_allegiant_airlines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce60199-31ae-4566-9d6b-62fb25ac970b/bafizizugevaxivawaxosamen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b7cad78-0881-4813-9d11-ee92d8505be3/bopojipi.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_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 5424 bytes
SHA-256: d3a8dd325bee70320cd7bce5f16049b914faa0d2a37d4b950853ce60a8c4a2c8
font_01_sfnt_off0001069c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069C 10896 bytes
SHA-256: 59887c541394f59305299d3437384081df123c15d4aa8cd65c99f28498911d35

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