Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23cebd87f12dd31…

MALICIOUS

PDF

89.5 KB Created: 2021-03-22 21:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 102e63ade55543745f3f67b6210566d3 SHA-1: f1e3c58f0d1a84567dad418178b04e964225155b SHA-256: d23cebd87f12dd3197e873b0dccebc708c5f5eb54c14a47094da04a93c2e0f00
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://ponafet.ru/aws?utm_term=starfinder+near+space+pdf+free
    • https://wuzovogupo.weebly.com/uploads/1/3/4/7/134720757/bbedb97c.pdf
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/busulepelixewe.pdf
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/6eff1dd4b53e.pdf
    • http://leafester.online/when_can_you_plant_tomatoes_in_south_floridajrr1g.pdf
    • http://legendnat.space/wifomoxananigur0c.pdf
    • https://xuvuvigaxopezut.weebly.com/uploads/1/3/4/7/134721928/7576411.pdf
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/8899899.pdf
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/3942357.pdf
    • http://fajiriduxir.medianewsonline.com/hiv_and_aids_symptoms.pdf
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/4317c39.pdf
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/4272109.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_934015b9cd324655a68a531087225936.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7298202a-dee6-4ec0-9735-6965668f24de/verbal_reasoning_test_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/31b9e0d2-bc34-4251-a7fc-dbfde21f4eef/kaplan_mcat_complete_7-book_subject_review.pdf
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_983dfcec59204e92a43905843d6947e8.pdf?index=true
    • http://poborunedajemo.onlinewebshop.net/nixizerovigojufa.pdf
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_9c274ef5ab6f46ad9bb2159aa32b767b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e1a98050-197e-4809-a1cc-61392d8f1ce1/rainbow_fish_coloring_page.pdf
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_575de835066e46c9b00a7aecb5fe211c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fdc4517b-bf81-428b-8208-553169e633e9/how_do_you_fix_a_septic_drain_field.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_off00011fad.bin
1f66a08a8044b35e97b1d3fd4ca412ea2d1585b3b9e0574cc090acfa97f04b9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 5220 bytes
font_01_sfnt_off0001317f.bin
2d406e0a6df552ccf50ae418bb769b5890407d8256ca0a2550d5d367f20ef51d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 11688 bytes

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