Malicious PDF — malware analysis report

Static analysis result for SHA-256 884e00713a0adfb9…

MALICIOUS

PDF

49.9 KB Created: 2020-12-20 04:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44b412216c4dc99bcc3070b5abfc4495 SHA-1: 510d9ba0e6a29e66429b3f94aef76a8df47caaf4 SHA-256: 884e00713a0adfb92946bfc8df5f0bac1c459a35b5bce4981ef5d6c00cab695d
184 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, with the embedded URLs likely serving as the primary attack vector. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9296

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://traffnew.ru/strik?utm_term=centennial+hall+umn
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/9142810.pdf
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5fbd97beef1c5.pdf
    • https://fiduwovizeget.weebly.com/uploads/1/3/4/5/134517619/2cf68.pdf
    • https://sebijulevezokoj.weebly.com/uploads/1/3/4/5/134512917/c9514adee.pdf
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/gobasilez_wipisifesesugu_mikivebimoxe.pdf
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/bff7b2a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/891944af-5e66-4022-bea6-7fe15e5ed397/essential_grammar_in_use_4th_edition_with_answers.pdf
    • https://s3.amazonaws.com/daselex/3648919740.pdf
    • https://static1.squarespace.com/static/5fdd2c3c5b7bc966055df3f1/t/5fdde82ba478394ebc92b29c/1608378411551/lajafozosizudofuniduwa.pdf
    • https://uploads.strikinglycdn.com/files/b9269a6c-f692-4b7c-a159-2fd33a7999a8/tejijadiwujafuwugi.pdf
    • https://static1.squarespace.com/static/5fc6880a0a2757459b09dab9/t/5fca6e1028c35756c19886a1/1607101969013/car_restoration_3d_online.pdf
    • https://uploads.strikinglycdn.com/files/124ac84c-8d7e-4a69-a872-13f350784108/sliegh_ride_sheet_music.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b794.bin
3c3dfc472ec0c495cbd1e6f01f48eb18b0911d6a9bc5633dd0b3c70671efb806
pdf-font-stream PDF embedded font (sfnt) at offset 0xB794 4556 bytes