Malicious PDF — malware analysis report

Static analysis result for SHA-256 82624fce88877c2e…

MALICIOUS

PDF

100.0 KB Created: 2021-04-05 07:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adc132574c38aec676bfbae979f83c11 SHA-1: bd7b011adf71e64576ac490898e802b2d3518519 SHA-256: 82624fce88877c2e37446034b8517f53bb26ed329932898b416e03c9b9c9b31a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO purposes. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=al%2528h2o%25296+3%252B+name
    • http://cmbmarketing.agency/viliwexus8tn12.pdf
    • https://zaximasuxudaris.weebly.com/uploads/1/3/4/5/134590642/wavij.pdf
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/jutesek-ledegap-fomuvizisaba.pdf
    • https://cdn.sqhk.co/rapawomo/tiihbrr/wanawalaxivorepi.pdf
    • https://cdn.sqhk.co/fuxuduxexi/dQvjbKm/15641640131.pdf
    • http://dokumenty-kiev.online/zikunelosatazaf60o2v.pdf
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/6223955.pdf
    • https://cdn.sqhk.co/gufemazibafi/RGAhfgW/sagidexejefunafa.pdf
    • http://wexypay.icu/482933622797v03x.pdf
    • http://milanomodaitaly.site/347627741671ytbx.pdf
    • http://tur8osale.site/bolimesuviregesosekek44xyc.pdf
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/680855fa5bc649.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_768ac301bc5642db8aad11db3fdf68e0.pdf?index=true
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_5bcf1bc1739a4cd0b84b554e106d672f.pdf?index=true
    • http://bizepusozuj.epizy.com/heritage_building_information_modelling.pdf
    • http://botodivezegi.rf.gd/35711816296.pdf
    • http://lodaxiku.rf.gd/allah_waariyan_song_free.pdf
    • http://jewexaruwibel.rf.gd/japuvorevumamevufosoxik.pdf
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_388503d949ae465087c13d0d1fbab384.pdf?index=true
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_e68d1d9b030341a098607a539066bfca.pdf?index=true
    • http://zomusuxine.rf.gd/supreme_commander_2_unit_guide.pdf
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_6d14b79cabc44ca182eaf4dea9dc4da2.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c61.bin
3417a8472b992d7956e85e423695af052070b76ea8b7b274fbda2f48a80c1027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 5244 bytes
font_01_sfnt_off00013e1f.bin
fc6884b86b8615eb21e23590afdf52eaa42fe42a5a34e4563f211256cd5942e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1F 13776 bytes
font_02_sfnt_off00016bd6.bin
f7e1426cef1be21e734b659c93fa15670581a6704c7fb1b6d8456a9be8e34136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD6 16260 bytes

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