Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7f0b95a5bc7b79…

MALICIOUS

PDF

83.2 KB Created: 2021-03-28 18:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1c63135f7c3628b7de5a9d65826dd54c SHA-1: 82a7b6dde30ac27e67a3bbaadd199a18c4ab7d01 SHA-256: 5a7f0b95a5bc7b79f9c8bdafd68d0165f421f5588dfd9acf4f27206c462b9ade
186 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 hosted on disposable domains, suggesting a link farm or SEO spamming operation. The document body, though heavily obfuscated, contains text related to 'John Deere gator 6x4 parts for sale' and references wkhtmltopdf, indicating it's likely a lure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly indicates malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=john+deere+gator+6x4+parts+for+sale PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458625/normal_5ff4ed492a303.pdfIn PDF document text
    • https://kenibojowosude.weebly.com/uploads/1/3/5/3/135324683/5678471.pdfIn PDF document text
    • https://moxatabik.weebly.com/uploads/1/3/4/8/134885740/957808.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/83875163799.pdfIn PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/xakipatafesu.pdfIn PDF document text
    • http://dakekunagefasak.sportsontheweb.net/60553580331.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/cdfipb_guarantor_form_2020.pdfIn PDF document text
    • http://tizadejaso.getenjoyment.net/33661249930.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/breathing_underwater_alex_flinn.pdfIn PDF document text
    • http://nature-ital.space/53009054707a2yi4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_6027cee77ae8c.pdfIn PDF document text
    • http://eferevole.com/analisis_literario_el_principio_del_placer_jose_emilio_pacheco9np6m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_60582328b032a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/24912139293.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_8068176e75244808a83b2c2a64d1e883.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/2004_wowwee_robosapien_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/nilobiduxegisot.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_bfb806ebf44b4fbb8411fd590114beb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zurovajij/college_panda_act_english.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/angular_formgroup_updateon_submit.pdfIn PDF document text
    • https://6c403777-3bdb-430d-a4ca-23d5788374d5.filesusr.com/ugd/e0034b_bcf53969983943b9ac2388553ba8c683.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_27258ee8a2604ef28850837927c22d8b.pdf?index=trueIn 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_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 5604 bytes
SHA-256: ddf8cb09b2ed6be1470586414da78ef81f40abf7841e64890390178b1c23b436
font_01_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 10844 bytes
SHA-256: f71bad519373a3e18ff06b9387e51dd168d3656c13a3de6c947615a58d541832