Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3a7a7a16b1c262…

MALICIOUS

PDF

81.5 KB Created: 2021-04-15 18:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b3a8666be597637e04280b5ed4e57129 SHA-1: 10375b1e431e908a4529bdeb492a96cd61c9c711 SHA-256: ba3a7a7a16b1c26250ebcf153b82c7695b67a4597c1503f29a521d3f94cc4ce2
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains text related to 'garmin app' and 'wkhtmltopdf', indicating a lure to a fake support page. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection, strongly indicates malicious intent. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=why+are+my+steps+not+showing+on+my+garmin+app PDF link annotation
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/2039757.pdfIn PDF document text
    • https://wirimodarezekas.weebly.com/uploads/1/3/5/3/135314182/2001588.pdfIn PDF document text
    • https://pabarubuvu.weebly.com/uploads/1/3/1/3/131379718/dda1482465.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/tidusadipa.pdfIn PDF document text
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/61d2ec142f.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/zixem-rufiremem-vududevirozed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420235/normal_60345158de0f9.pdfIn PDF document text
    • http://hookup757.fun/23282304760xe6w9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461777/normal_5feba0c648dee.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/66692689183djt13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475719/normal_6054485fddb94.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/xeluleboruzixiwaneg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5fcbe93e4be5f.pdfIn PDF document text
    • http://iranomics.com/is_world_war_z_free_roami7771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_6056602331199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480594/normal_5ffbf4dc194a0.pdfIn PDF document text
    • https://webeboxux.weebly.com/uploads/1/3/4/4/134493090/zezenukoradi.pdfIn PDF document text
    • https://lurotafimeka.weebly.com/uploads/1/3/0/7/130740015/8707693.pdfIn PDF document text
    • http://specrazreshenie.com/marketing_administrator_salary_ukzrkv3.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/1274884.pdfIn PDF document text
    • https://xapotitiguwux.weebly.com/uploads/1/3/4/6/134668809/0fcce183.pdfIn PDF document text
    • http://uber-global.com/baby_boy_names_meaning_god_answers_prayersz50da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 5408 bytes
SHA-256: f467ea332ec90ce3ec38d63a2f687df95153eb226a8c92defd8ceda20b608f3b
font_01_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 11560 bytes
SHA-256: 61e05b2abd753e7e0be0dc1bd1d64529a9310280aed7fdf00debafe69f9fc0e5