Malicious PDF — malware analysis report

Static analysis result for SHA-256 59245ad4b21ffd53…

MALICIOUS

PDF

77.3 KB Created: 2021-03-15 15:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44f3915e09ccca3e45f331f4227007c7 SHA-1: 1bb7cb9afd2ed77d94fdf46e93a413c6ea489255 SHA-256: 59245ad4b21ffd5374691c6b76133dcf0c30319bd9e6a0658d41d410b146e914
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a "PDF_SEO_LINK_FARM" suggesting a large number of outbound links. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically flagging it as a phishing trojan. The embedded URLs, particularly the one related to a "wireless adapter free" offer, point towards a phishing or scam campaign designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=wireless+adapter+free
    • http://vamidotaxipigop.iblogger.org/xavizuxezodufofuwogegigu.pdf
    • https://cdn-cms.f-static.net/uploads/4475382/normal_60226cd399109.pdf
    • https://serivuzoforin.weebly.com/uploads/1/3/4/3/134334639/5708973.pdf
    • https://milorupubi.weebly.com/uploads/1/3/4/3/134317418/bopemelubu_fosovalesape_dolux.pdf
    • http://silorab.22web.org/28706754946.pdf
    • https://venunuwaxel.weebly.com/uploads/1/3/2/7/132740799/29d8560cdeee8a.pdf
    • http://tivadejasuxaso.22web.org/42993896793.pdf
    • http://vojutivuzijan.22web.org/92997781267.pdf
    • https://cdn-cms.f-static.net/uploads/4402517/normal_600a5b793cbf3.pdf
    • https://satiwumufov.weebly.com/uploads/1/3/4/7/134724604/133061.pdf
    • https://static.s123-cdn-static.com/uploads/4462046/normal_5feaffeb0abef.pdf
    • https://kadilawozozupaj.weebly.com/uploads/1/3/0/7/130739633/nokegotekoxed_nopufome_lijafegovewi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gulapore/72078040314.pdf
    • https://s3.amazonaws.com/rebesudanolo/90288797746.pdf
    • https://s3.amazonaws.com/xukonakefules/divinity_original_sin_2_trophy_guide_ps4.pdf
    • https://s3.amazonaws.com/wovedukevikov/zamejegofetomav.pdf
    • http://viladanus.epizy.com/7705013857.pdf
    • https://s3.amazonaws.com/xomepixo/17006952101.pdf
    • https://s3.amazonaws.com/mejobu/bteup_marksheet_verification_2019.pdf
    • http://jejotatimub.rf.gd/95526823230.pdf
    • https://s3.amazonaws.com/naxozelozude/gta_online_beginners_guide_reddit.pdf
    • http://letupekego.rf.gd/border_patrol_uniform_regulations.pdf
    • https://s3.amazonaws.com/fofeguj/how_to_install_nuance_power_advanced.pdf
    • https://s3.amazonaws.com/degagaziv/full_hd_cb_edits_background.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd48.bin
3bdff11b06db930cbeee547abe6489ed753262bf524ac02b694a5a428e7d514c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 5048 bytes
font_01_sfnt_off0000ee8f.bin
c94f1cc3b7aa545fa9638756d34250af6aba2c612bd0a8d663a14a09750aa05f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 10588 bytes
font_02_sfnt_off000112f2.bin
2d97eb5b8c66583654a55461b75ebc9d5954fe3bb26bfbf5761d5bfdae6bb250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 16060 bytes

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