Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5c34c928c505a5…

MALICIOUS

PDF

73.3 KB Created: 2021-03-01 14:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a31623af54c2d1b066e5db75a5cfcf43 SHA-1: 6d937274cbe85a49fc23820933533e9ee7bfffac SHA-256: fa5c34c928c505a56f1daa06464f4a01b458676a3a0cf005f4641811a321c786
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=grace+mcdonald+odessa+tx
    • https://lakojelot.weebly.com/uploads/1/3/1/6/131637836/birulixo_buxeligegovan_dopapav.pdf
    • https://cdn.sqhk.co/rapawaferew/jhijggn/xesiji.pdf
    • http://mebets.xyz/76365769619h9nap.pdf
    • http://tvoyoproc.fun/bodyboss_ultimate_body_fitness_guide_freegkpvz.pdf
    • https://zirilomeme.weebly.com/uploads/1/3/6/0/136025267/8789375.pdf
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/7342306.pdf
    • http://trastqort.online/how_to_unclog_shark_genius_steam_mopjwiee.pdf
    • https://bowefolezoz.weebly.com/uploads/1/3/1/4/131407704/saduxodedonosakujuf.pdf
    • https://cdn.sqhk.co/bapisolel/pxUghK1/camera_control_pro_2_nikon_d800.pdf
    • https://cdn.sqhk.co/zodunoxurob/cOFgdie/4826605038.pdf
    • http://cybety.xyz/simurabureranukutajugofavtaxmr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pabaxekuvo.rf.gd/stainless_steel_sheet_gauge_tolerance.pdf
    • http://mosararivifu.rf.gd/broken_movie_2018_song.pdf
    • http://bixivanudupona.epizy.com/castor_informatique_2018_entrainement.pdf
    • https://s3.amazonaws.com/sifawekujiki/zaponowamaxeziteted.pdf
    • http://katoxez.rf.gd/chrome_manager_auto_resume.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_off0000e353.bin
27b5eedb116233930032153a4deca389a66e2267b75986b625088d3957b5d869		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 5184 bytes
font_01_sfnt_off0000f4e2.bin
173f09c61485b89d4edab1c4ce81bcc8448e65603bbc8b84ad19b5193a915913		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 10500 bytes

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