Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f3b057da526206…

MALICIOUS

PDF

78.5 KB Created: 2021-04-05 04:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 30f4a98c6c6699908224e09f8f10c0fc SHA-1: 456fc5925b550f524f307344432c71d76967888a SHA-256: b8f3b057da52620693d9813841dc5cc636063bdd09c5248c7b97023396bcc89f
206 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to product manuals and search terms, aligning with a lure to encourage users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=everstart+battery+charger+60108m+manual PDF link annotation
    • https://bosebekepomij.weebly.com/uploads/1/3/4/8/134870535/velivom-fukidusesubem-tawozepevopazuk.pdfIn PDF document text
    • https://wovadipe.weebly.com/uploads/1/3/4/4/134462462/tadesogiwuzu.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/wakewinaza_radawamiri_komitabu_sakopemafisari.pdfIn PDF document text
    • https://sutopudebesi.weebly.com/uploads/1/3/1/4/131438093/tedanadobar.pdfIn PDF document text
    • https://jatibamed.weebly.com/uploads/1/3/4/6/134649143/a6188d.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/2da7345e.pdfIn PDF document text
    • https://sinaxerepedosuj.weebly.com/uploads/1/3/1/3/131398545/zisijivarosine-dapujerudik-zasedak-wugiku.pdfIn PDF document text
    • http://jinokonur.22web.org/colon_punctuation_worksheets.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/fd294e4030577.pdfIn PDF document text
    • http://sezuxol.22web.org/90581192639.pdfIn PDF document text
    • https://vubujoxesawuzar.weebly.com/uploads/1/3/4/4/134476738/dekixaxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nopizapokife.epizy.com/sharabi_amitabh_bachchan_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d95189-4309-45e1-9f0a-6ef700217d28/present_perfect_continuous_advanced_exercises.pdfIn PDF document text
    • http://girodoge.epizy.com/dipoz.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/sarofevobejavep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06389092-f61f-4c14-abb0-d1ad52461109/diarios_de_motocicleta_che_guevara_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/jotukixikatefuvojepus.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/chef_resume_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e111e52-d428-45bd-bb5a-d9715990a635/sanur.pdfIn PDF document text
    • http://tezofer.rf.gd/lozinajugijezesezelufib.pdfIn 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_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 6012 bytes
SHA-256: 458d728eb9a9c7d52e53bf05471a8c0858b615a2450fd1c96639551542b07529
font_01_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 10472 bytes
SHA-256: f49f3f860e0efe3459ca3a0f7ed505003f5befeeca616ac911b59a46dee55d50