Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47a5431ecdcbe25…

MALICIOUS

PDF

79.2 KB Created: 2021-03-25 01:04:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca5a11521fd0b505275fb50aefc5b907 SHA-1: 908a80bfb57510757efed19e55617eb745f42d7f SHA-256: d47a5431ecdcbe258c2b1cc2207f5fc9bf77288bdfc4658ee9a9d042a0ab743c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to 21 other PDFs. One of the primary external URIs, 'https://soxebez.ru/123?utm_term=hazardous+substances+register+template+wa', suggests a lure related to hazardous substances templates. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/123?utm_term=hazardous+substances+register+template+wa
    • https://lidobovinibun.weebly.com/uploads/1/3/4/8/134861857/dunujaduw.pdf
    • http://koreanluxe.com/dukuzagepigimabezafusawwocto.pdf
    • http://amsidgi.xyz/76864427850z324h.pdf
    • https://fudegedetet.weebly.com/uploads/1/3/4/7/134733785/velodejuzorasop_fuluroduziru.pdf
    • https://ponozivodu.weebly.com/uploads/1/3/0/7/130775347/vowapodu.pdf
    • https://gobexuxiwabi.weebly.com/uploads/1/3/4/3/134372757/5454126.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuliwisuwig/the_improbable_adventures_of_sherlock_holmes_audiobook.pdf
    • https://s3.amazonaws.com/palikuvexake/agenda_2020_excel.pdf
    • https://s3.amazonaws.com/datarofapakil/agilent_34401a_manual_espaol.pdf
    • https://uploads.strikinglycdn.com/files/4bcba4be-cdf8-45be-8ba0-b8e587c37111/mipegirukebapapimavawe.pdf
    • https://uploads.strikinglycdn.com/files/b00d4a56-2b76-498a-8086-5fe611673353/mofaxetufivixabowok.pdf
    • https://s3.amazonaws.com/mokixetat/16552196177.pdf
    • https://s3.amazonaws.com/wiwuxot/8265391074.pdf
    • https://uploads.strikinglycdn.com/files/27854de6-3f2f-4b68-ae7b-ffa445f698fd/kulikepagedezijalaku.pdf
    • https://uploads.strikinglycdn.com/files/4e42380a-737c-4506-b420-28bd720c7a62/sitikidob.pdf
    • https://s3.amazonaws.com/tarajix/history_of_buddhism_in_thailand.pdf
    • https://uploads.strikinglycdn.com/files/a11efe3c-c433-4a82-966f-0a9d29bf98db/types_of_issues_in_public_relations.pdf
    • https://uploads.strikinglycdn.com/files/2322c6dc-4cbd-4002-bc62-b84617c2170e/best_gmat_books_amazon.pdf
    • https://s3.amazonaws.com/zolerazowubow/71726424635.pdf
    • https://s3.amazonaws.com/fuzafuzeruwit/70953091783.pdf
    • https://s3.amazonaws.com/tedowafomaru/bosch_silence_plus_44_dba_cancel_cycle.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b4.bin
be687c8a73199eaac6bc31d12898735a7ae3a956e3bd6048e9ddfedab7be6b59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 5636 bytes
font_01_sfnt_off000109db.bin
e8e8542b88de6101646f5e80d1f852d7e278baaa28955725a72b3a49776721a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 10872 bytes

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