Malicious PDF — malware analysis report

Static analysis result for SHA-256 d962eb43f423d9ce…

MALICIOUS

PDF

81.3 KB Created: 2021-03-23 04:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb18fc2a85c3b3b40ceb684f65ce44b0 SHA-1: e1a482298eb4babc1370895846546dde7d738618 SHA-256: d962eb43f423d9cec1890df2251410e05b0f9dc0e1092fe27fb6fb63904300af
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to benign resources, but one key URL, 'https://leonvi.ru/award?keyword=anaerobic+digestion+of+biomass+pdf', is associated with a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely for phishing or SEO manipulation purposes. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://leonvi.ru/award?keyword=anaerobic+digestion+of+biomass+pdf
    • http://bioforce-co.site/81035467721vpn4c.pdf
    • http://grusha.space/664904865044q511.pdf
    • http://avtoshtorki.shop/xizejafafoluruk7cdv9.pdf
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/vaputuzixi.pdf
    • http://najetaxu.mygamesonline.org/57022933184.pdf
    • https://rigopodi.weebly.com/uploads/1/3/4/3/134307943/dumopif.pdf
    • http://vkrowl.com/xobevivalido44p5y.pdf
    • https://vekazapez.weebly.com/uploads/1/3/4/6/134601327/57802f7cd281a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xoguwavosuje/what_are_the_4_major_goals_of_psychology.pdf
    • http://jazopizebe.atwebpages.com/zifujepomuxoraf.pdf
    • https://uploads.strikinglycdn.com/files/5a8d2b03-b8d4-402b-9bab-481c3d4d1a31/13653015293.pdf
    • https://s3.amazonaws.com/rujabepifar/3232554206.pdf
    • https://s3.amazonaws.com/mexavofezoxi/dialisis_adalah.pdf
    • http://gemawinikifiv.myartsonline.com/40048204731.pdf
    • https://s3.amazonaws.com/jewizopukuni/7330104144.pdf
    • https://s3.amazonaws.com/xufaxoferugod/tofadurodudevugabexixewi.pdf
    • https://s3.amazonaws.com/jenagubadopi/69821436727.pdf
    • https://uploads.strikinglycdn.com/files/7895cb15-4c84-456c-8cf2-416e323759d5/the_secret_life_of_walter_mitty_full_movie_sub_indo.pdf
    • https://uploads.strikinglycdn.com/files/5b286e03-018a-4154-968e-0e74c873accf/counting_by_7s_book_talk.pdf
    • https://s3.amazonaws.com/mojivikapeti/3510779863.pdf
    • https://s3.amazonaws.com/tutapaxi/conjugar_verbos_en_ingles_todos_los_tiempos.pdf
    • https://s3.amazonaws.com/jidosatikim/81793207951.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_off0000fbff.bin
b83ea3993f3795ccdc450941170d46ff0a7d009879a33c91fb42dd28b022bca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 5572 bytes
font_01_sfnt_off00010edb.bin
4de37eec5fcc13bc05522f285ff74c7ef53f1364ee0bdff915794e9529cbd2a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 11528 bytes

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