Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d29694d37d0dd64…

MALICIOUS

PDF

76.8 KB Created: 2021-03-06 11:32:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56614b5a02fb36e536d0810f6f209d84 SHA-1: 3da3a953cefe57dd8e8948e2a4bb1052c6d3d1b9 SHA-256: 6d29694d37d0dd642d088cd4878103270066ef039f7ce0cbd950b97dc656d5e6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm for SEO manipulation or to redirect users to malicious sites. The embedded content, though heavily obfuscated, likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/aws?utm_term=invisible+man+ellison+quotes
    • https://komibaxes.weebly.com/uploads/1/3/1/6/131606619/wefifafasavize_bufitufuxasew_tenabunavok_patifedip.pdf
    • https://farejebizaf.weebly.com/uploads/1/3/0/8/130815013/bewazi.pdf
    • http://lusolakidareve.mywebcommunity.org/how_much_is_a_used_yamaha_baby_grand_piano_worth.pdf
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/midub-lolakovurabupu-gipufeketem.pdf
    • http://notdull-eng.online/linear_functional_analysiswiwj8.pdf
    • https://mosozedap.weebly.com/uploads/1/3/1/8/131856454/nuzafababuje.pdf
    • https://tofudilasikota.weebly.com/uploads/1/3/0/9/130969343/8f9a59909.pdf
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/1061282.pdf
    • https://divowugu.weebly.com/uploads/1/3/6/0/136022164/towuz.pdf
    • http://kerosijuvibeg.scienceontheweb.net/96686301224.pdf
    • http://trenolgia.buzz/car_racing_2018_android8nfks.pdf
    • https://totelulipax.weebly.com/uploads/1/3/4/4/134469391/3673424.pdf
    • http://immortal-sho.club/adrenalizou_o_meu_coraomhzlx.pdf
    • http://wonnaturila.space/stacionarni_telefon_panasonic_kx-tgc210fxb8ljkq.pdf
    • http://getepitisux.mywebcommunity.org/filirumemiwujedaparufasu.pdf
    • http://zolepop.mypressonline.com/nexuvijuwanezekabokijiwek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kasuwevovog/78337724563.pdf
    • https://s3.amazonaws.com/meludav/90883454378.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_off0000ef73.bin
fc2e9a961e8d5467da4b430c10a5a4bb071b67026f92180c91a96e9f9fa3b9f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 4996 bytes
font_01_sfnt_off00010064.bin
582bb386cce0f04744f1a83d7b11ac5ee29313732deafa1c1f5d3ab8b40a781a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 11168 bytes

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