Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cad7469140f31d2…

MALICIOUS

PDF

84.5 KB Created: 2021-01-31 03:35:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9ba7894f4a7160ec19dc1fc3eb2f407 SHA-1: bffffa6aca80a08431b357b549569141e622ef70 SHA-256: 2cad7469140f31d29d759e88e9001b33d4f5ed65f28d5a1ab44ae9b48971f287
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV detected it as 'Pdf.Phishing.Trojan'. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/aws?utm_term=don+bradman+cricket+17+ppsspp
    • https://static.s123-cdn-static.com/uploads/4408463/normal_5fc9983e56e81.pdf
    • http://wiinorama.space/how_to_reopen_closed_windowhmah2.pdf
    • http://copyrighthelpptteam.com/golezabitakilu6m9zq.pdf
    • https://static.s123-cdn-static.com/uploads/4496816/normal_600754b40cf4b.pdf
    • http://com-connexion.xyz/61747139966exqxa.pdf
    • http://snatural.space/9030680557bb70u.pdf
    • http://usersdeviceprotectionservice.site/449288531198do2f.pdf
    • https://static.s123-cdn-static.com/uploads/4485318/normal_5ff2b3f66a444.pdf
    • http://opsnatur.fun/xagajesisejed0c1m.pdf
    • http://com-free-fire.com/302123375507muon.pdf
    • http://richteam.site/kokulokekubemomon8va20.pdf
    • http://vitalia-transports.com/arp_guard_wifi_security_apke854q.pdf
    • http://ekzo-fruit.ru/dugerulusisutijerowewbbcv.pdf
    • https://static.s123-cdn-static.com/uploads/4496193/normal_5ff84bb78ba99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xidazeze/medafulowisonibeton.pdf
    • https://s3.amazonaws.com/jadere/deficiency_account_insolvency_template.pdf
    • https://s3.amazonaws.com/sepawi/32685620829.pdf
    • https://s3.amazonaws.com/taguxif/kugew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea30.bin
7320b8b1b153edd6fea2e57ed8a25e8a0dd048530a4c5cdbf7fe1b08ef16ec0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 5308 bytes
font_01_sfnt_off0000fc26.bin
54128db47484c9797b9f5f7ba7190d24092a2521fc610578b00f35306b04683e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 10692 bytes
font_02_sfnt_off000120f9.bin
95f2a8319533f051e584a9e2aa38e8d42f7eb419abe795cf0dce2d6390e2c0a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 16204 bytes
font_03_sfnt_off0001362b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1362B 4324 bytes

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