Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ab53adbfef17c9…

MALICIOUS

PDF

72.0 KB Created: 2021-06-11 10:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8d14296ed4273cf98068f0dbb2a4058 SHA-1: ecce76c89d8d57f01183a4296f64b5158aeb9545 SHA-256: 63ab53adbfef17c9f99f351f0bdcb9e4ec4bc2e7e9e3a9c727febb7ed313e1d4
246 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document attempts to trick users into revealing sensitive information like private keys or backup codes. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification, likely as a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 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://coretry.ru/pbw?utm_term=snap+score+hack+bot
    • https://nuzidobekoxap.weebly.com/uploads/1/3/4/7/134750252/matadukegel-jakun-bividozelaji.pdf
    • https://cdn-cms.f-static.net/uploads/4475219/normal_5fd2e610e0611.pdf
    • https://xiduzejeg.weebly.com/uploads/1/3/1/6/131606953/zofasoxu-kokipurafevum.pdf
    • https://bifutizuwosedi.weebly.com/uploads/1/3/4/6/134645412/pukaxugiwasasi-wajosad.pdf
    • https://megafibi.weebly.com/uploads/1/3/4/3/134347288/zobumalo-mijesimitowa-viwiwedez-lodozodobiwom.pdf
    • https://cdn-cms.f-static.net/uploads/4365998/normal_602fc2a692dfb.pdf
    • https://nirusiji.weebly.com/uploads/1/3/1/4/131407521/seguninizufegopibiwa.pdf
    • https://guwidavimup.weebly.com/uploads/1/3/4/8/134893931/7375291.pdf
    • https://static.s123-cdn-static.com/uploads/4470524/normal_5fdf3676e322d.pdf
    • https://xixivisowokote.weebly.com/uploads/1/3/2/8/132814838/migebafasurezita.pdf
    • https://kosazuritejozu.weebly.com/uploads/1/3/0/8/130874521/cf8cbe545e9.pdf
    • https://mopuxemunokele.weebly.com/uploads/1/3/5/3/135318458/kamevetos_kukikowamep.pdf
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/vozomopir.pdf
    • https://modovepa.weebly.com/uploads/1/3/4/4/134464072/3148147.pdf
    • https://static.s123-cdn-static.com/uploads/4474978/normal_5fce5d8983a72.pdf
    • https://cdn-cms.f-static.net/uploads/4462736/normal_605115fa4ab89.pdf
    • https://sixisamut.weebly.com/uploads/1/3/5/3/135308299/pelofasik-pofisax-jajuwizujuje.pdf
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/nurim-sulegamiza-majav-vesategadevege.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jananevava.pbworks.com/f/82368422312.pdf
    • http://felefejimax.pbworks.com/f/reebok_zr9_cross_trainer_for_sale.pdf
    • http://lekadebixe.pbworks.com/f/46649501263.pdf
    • http://ziludezubeju.pbworks.com/f/nupono.pdf
    • http://tebejeloxid.pbworks.com/w/file/fetch/144423396/29694061926.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6b.bin
5016830c80471650ee2350f7302f49d015451c37005841379f8247832db30707		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 5296 bytes
font_01_sfnt_off0000ef62.bin
ccdba8b85a012785fde9238c526a2e4cb1eb9634b30567e27885e9cc8beb8cab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 10508 bytes

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