Malicious PDF — malware analysis report

Static analysis result for SHA-256 000a4e4c91730c74…

MALICIOUS

PDF

92.7 KB Created: 2021-03-10 19:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4c2e83c5e260a80c5243969618c6f58 SHA-1: 4241e1db3dd772812f9f4d552c5ce8cefc95e02c SHA-256: 000a4e4c91730c742d7e784e5c67a71a96093bb228c2246a1187716533760fcb
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The presence of a 'download' button lure further supports a malicious intent to redirect users to potentially harmful content. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/award?keyword=brahmastra+by+ajay+gulati+pdf+free+download
    • https://ruxuxosiforedop.weebly.com/uploads/1/3/4/4/134491380/6779178ab37.pdf
    • http://zijafanovidiz.sportsontheweb.net/tevesosixin.pdf
    • https://vukujaxirebes.weebly.com/uploads/1/3/4/1/134108713/junoduban-jiwakamobi-nugafit.pdf
    • https://gozikiri.weebly.com/uploads/1/3/4/4/134493270/fobirulewasaraj-dazefefigopopur.pdf
    • https://cdn-cms.f-static.net/uploads/4404124/normal_5fdb61cadc6df.pdf
    • https://static.s123-cdn-static.com/uploads/4417808/normal_5fe3c87148bd7.pdf
    • http://texifudosino.mygamesonline.org/gurekateza.pdf
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/tuxep.pdf
    • https://cdn-cms.f-static.net/uploads/4424029/normal_5fe9f347b8b66.pdf
    • https://cdn-cms.f-static.net/uploads/4393890/normal_60412eb8d8c0a.pdf
    • https://regofixaf.weebly.com/uploads/1/3/5/3/135318676/lumexexom.pdf
    • https://wajefoxefibivi.weebly.com/uploads/1/3/2/8/132814680/886f0da18d9bc.pdf
    • https://cdn-cms.f-static.net/uploads/4473916/normal_6022559357957.pdf
    • http://lubenoredeji.mypressonline.com/39041556445.pdf
    • http://kutatit.getenjoyment.net/dbx_driverack_480_price.pdf
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/dafoseku.pdf
    • http://tonemisi.medianewsonline.com/gazepuzofukafer.pdf
    • http://xedeporib.medianewsonline.com/the_maze_runner_series_in_order_books.pdf
    • https://cdn-cms.f-static.net/uploads/4446774/normal_6027eba07363c.pdf
    • http://felagem.getenjoyment.net/they_that_wait_upon_the_lord_song_download.pdf
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/8775902.pdf
    • http://xuwuvewisin.mypressonline.com/82093202.pdf
    • https://lenatazuponos.weebly.com/uploads/1/3/4/8/134888684/nipuzatiluwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://vegubom.atwebpages.com/fema_is_100_c_answers_reddit.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa9a.bin
ac9a820be5b477ecf5c82fc9ec3a72003cd879661b2fed5239b213c554359219
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 5916 bytes
font_01_sfnt_off00010ea4.bin
7095bb550aca5986ee2697879642a4786df85ffab2802630bcb0bddf725fbc5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 2452 bytes
font_02_sfnt_off000119c1.bin
a2593c737832fb37cfeb25dc74fd53f1dcdd6806ff704a38fdef7ce8d33664da
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 10780 bytes
font_03_sfnt_off00013ed5.bin
f3d47dd0e0f95b01982608b7268af11fbb504b90820c18217a94119dd0f26730
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED5 16528 bytes
font_04_sfnt_off00015528.bin
7b783f5aba0a4f40fd2752a7b6c992a75504f868b0aa9f505359868798c116de
pdf-font-stream PDF embedded font (sfnt) at offset 0x15528 3856 bytes