Malicious PDF — malware analysis report

Static analysis result for SHA-256 54659194c4205b67…

MALICIOUS

PDF

68.9 KB Created: 2021-01-21 02:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ba372c6262b5af0f30c0c9c724bc6721 SHA-1: 9a0a17bc7125840ef95eefefa6723ceaaa185fa2 SHA-256: 54659194c4205b67923c4da5ac5ce6166d4f5ace8155303895e95a5d62cbce44
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body, though truncated and containing non-readable characters, includes metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with the link farm heuristic.

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://jottigo.ru/123?utm_term=sportz+truck+tent+ii+instructions PDF link annotation
    • https://site-1177661.mozfiles.com/files/1177661/43343984729.pdfIn PDF document text
    • https://site-1175236.mozfiles.com/files/1175236/bionaire_cool_mist_tower_humidifier_manual.pdfIn PDF document text
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/8287cd6ce5f8768.pdfIn PDF document text
    • https://luwegojozokozop.weebly.com/uploads/1/3/0/9/130969796/1678184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420911/normal_5f99c0e65285d.pdfIn PDF document text
    • https://wakaxizuso.weebly.com/uploads/1/3/5/3/135322555/9f02377bb6e7f55.pdfIn PDF document text
    • https://site-1176115.mozfiles.com/files/1176115/phoenix_wright_ace_attorney_justice_for_all.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/cc7add5026c49f8.pdfIn PDF document text
    • https://xesapexoxes.weebly.com/uploads/1/3/4/6/134633169/zenepigonibedetabawi.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/vasot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473622/normal_5fd6782bca5db.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/MiigjUY/dragon_village_world.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5ff98f966b6ca.pdfIn PDF document text
    • https://newafiramolik.weebly.com/uploads/1/3/1/0/131070062/bazitesuferax-jovaxivime.pdfIn PDF document text
    • https://kiradaropamun.weebly.com/uploads/1/3/1/0/131070158/wiwedinisuvitakagok.pdfIn PDF document text
    • https://gusoretudofuriv.weebly.com/uploads/1/3/4/8/134885571/7810508.pdfIn PDF document text
    • https://site-1201629.mozfiles.com/files/1201629/2744054058.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/Jvohdtr/tumblr_girl_drawing_black_and_white.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/5hiihQb/plants_vs_zombies_2_download_free_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/hjjjhcH/debudewidixunoti.pdfIn PDF document text
    • https://cdn.sqhk.co/kamupudoro/ICifdig/hello_you_cool_cats_and_kittens_meme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FC 4784 bytes
SHA-256: d1580f90fb17e087458d91d0bd2468506261ae4fa2236eae5189183c61da04ce
font_01_sfnt_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 10512 bytes
SHA-256: fc3f7fb86c72fc87b35b98f898130b65efc55c2c2d01a50c1883ed4fb200b820
font_02_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176