Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f43e2c37f317c61…

MALICIOUS

PDF

76.0 KB Created: 2021-06-10 02:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a273ff2a5c858b99b73b2b19c1a95867 SHA-1: 5520aca016b840f94be0d8125df9794b174affd3 SHA-256: 6f43e2c37f317c61ea9bbd656c0392dc004218a5fc239c6867bda18c9cf500a0
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, identified as a link farm. The primary URL, https://queure.ru/pbw?utm_term=follower+bot+roblox, suggests a lure related to social media bots. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://queure.ru/pbw?utm_term=follower+bot+roblox PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393180/normal_5fdc0df5b2d89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_602d633d6cdc4.pdfIn PDF document text
    • https://zinenefubodejig.weebly.com/uploads/1/3/4/3/134338026/2686209.pdfIn PDF document text
    • https://gugebizibepowe.weebly.com/uploads/1/3/4/3/134364706/ae06aca972.pdfIn PDF document text
    • https://zixudepapu.weebly.com/uploads/1/3/2/3/132303172/setawetela.pdfIn PDF document text
    • https://nibivesulekot.weebly.com/uploads/1/3/4/0/134017222/kusosemuj.pdfIn PDF document text
    • https://tuvonozesafuk.weebly.com/uploads/1/3/4/6/134600303/be2c07d407a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415974/normal_604b8bec364ed.pdfIn PDF document text
    • https://nugasoxitobaj.weebly.com/uploads/1/3/2/7/132710773/xigulowaruwer_jesebepo_dimubef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_6038c124a0437.pdfIn PDF document text
    • https://zuzidoparifiga.weebly.com/uploads/1/3/5/3/135302874/93192234657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401732/normal_6007a7d734ba6.pdfIn PDF document text
    • https://mosatidopo.weebly.com/uploads/1/3/4/7/134731439/f0ea4f762.pdfIn PDF document text
    • https://varusotefus.weebly.com/uploads/1/3/1/3/131398431/vuneguma.pdfIn PDF document text
    • https://wivapofeselaf.weebly.com/uploads/1/3/5/3/135317026/puxuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_600cc245c574b.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/7841644.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410703/normal_5ff1d727418df.pdfIn PDF document text
    • https://tafejopaz.weebly.com/uploads/1/3/4/0/134012310/xurofolikabode_kapatipoxa_taralil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funinupun.pbworks.com/f/xugukewidinu.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/w/file/fetch/144464493/devimojofuwamazud.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/78056072031.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/77806212844.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_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 4544 bytes
SHA-256: 12708116aad11896aacfd146a10ba2d8c82bd2b2e04e4a2f559b4d7c0251ed8f
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 11004 bytes
SHA-256: d7ad6ad721209c05f927f61611921aea517b196d2f6082c70b0a87f266e05687