Malicious PDF — malware analysis report

Static analysis result for SHA-256 b814616d20f31c80…

MALICIOUS

PDF

89.4 KB Created: 2021-02-23 13:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fe84822cd2682cd12e02243cefeb7b0c SHA-1: 684dfeb9b574af656fbe30140a53059c4c32a319 SHA-256: b814616d20f31c80dc3e2a8449f575d76186f7b2fcda4d55243b2f0925e01993
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The presence of a password-protected archive lure heuristic indicates an attempt to conceal malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jottigo.ru/wix?keyword=minecraft+hatchery+how+to+breed+chickens PDF link annotation
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/fa9160c.pdfIn PDF document text
    • http://sapinatuligoro.22web.org/ruwebex.pdfIn PDF document text
    • http://academic-club.ru/13618495295ylzln.pdfIn PDF document text
    • https://vopobibipudo.weebly.com/uploads/1/3/4/6/134620476/kazin.pdfIn PDF document text
    • http://trelon.fun/51777883607jk6rv.pdfIn PDF document text
    • https://fovezifume.weebly.com/uploads/1/3/0/8/130874198/8815262.pdfIn PDF document text
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/magilezaxex.pdfIn PDF document text
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/2470127.pdfIn PDF document text
    • http://libertinemodels.com/sagafutofafobisafavaniju0wwfh.pdfIn PDF document text
    • http://outputqwvk.space/free_short_film_scripts_for_studentsbg8gl.pdfIn PDF document text
    • https://satepiwe.weebly.com/uploads/1/3/5/3/135350267/4073914.pdfIn PDF document text
    • http://ostanni.fun/dreamcast_full_rom_seth2wgz.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/5218688289xt69s.pdfIn PDF document text
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/5339386.pdfIn PDF document text
    • https://wisatevifo.weebly.com/uploads/1/3/0/7/130775851/559f6f71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitudisejopelak.rf.gd/sepak_bola_liga_indonesia_2019.pdfIn PDF document text
    • http://xutulatovemi.epizy.com/88062728261.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_off00012124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 5480 bytes
SHA-256: 96f1e2d381fddf19f74b7e246e2a772360bcdeb449dd8af1901271ea552f2976
font_01_sfnt_off000133e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E3 10752 bytes
SHA-256: 1efc442345fd5491dfa51f90d1954eb0cee1fec53620e3f531592a34e60c5668

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