Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a0dadf7a7b1460…

MALICIOUS

PDF

194.6 KB Created: 2021-03-23 11:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6fa2c79364fda26dfb41005a3e6a509 SHA-1: 5176407405b66aa846dcdb4b462ecd776360d1db SHA-256: 65a0dadf7a7b1460e06eb0ca6dcaf226563535f094c56f094541f83d72506b40
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded links, many pointing to disposable hosting or link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://zajinet.ru/strik?utm_term=strong+concordance+1115
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/6550212.pdf
    • http://sugameloxufe.mywebcommunity.org/79481803934.pdf
    • https://cdn.sqhk.co/xawodoze/gji1v76/getty_images_free_videos.pdf
    • http://copyrightsupportforlnstagram.com/zadekos3yfvv.pdf
    • https://sepuvoguzunisam.weebly.com/uploads/1/3/4/4/134488558/60c72344736.pdf
    • https://cdn.sqhk.co/jinubodilev/9mnhamt/11436667573.pdf
    • http://sluzhba1.net/reach_annex_ii_formatogzbr.pdf
    • http://jofosisajagov.iblogger.org/reflective_practice_writing_guide_vocabulary_aid.pdf
    • http://kengoru.space/26813639150xgpn9.pdf
    • https://sugelama.weebly.com/uploads/1/3/4/8/134898925/4529171.pdf
    • http://thecet.xyz/39073113013mmx3w.pdf
    • http://specrazreshenie.com/viserogevewujewujaxidoprmq04.pdf
    • https://cdn.sqhk.co/terasovo/JFkagh1/17550504027.pdf
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/nukuluridi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zexozavo/grammar_land_2.pdf
    • http://vujijemu.atwebpages.com/30725983671.pdf
    • https://s3.amazonaws.com/fizup/lurexulodavoderilav.pdf
    • http://gijuvaginitawaz.epizy.com/automatic_door_opening_and_closing_system_using_pir_sensor.pdf
    • https://s3.amazonaws.com/liwafo/sojukukemud.pdf
    • http://gajutar.onlinewebshop.net/rulapusakixarujagotoka.pdf
    • http://lekaleramitogal.rf.gd/39582721289.pdf
    • https://s3.amazonaws.com/liguwubore/words_that_start_with_k_for_kindergarten.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_off0002a556.bin
887ad831d0d8b0fc2388f671c216aaaf9f83a7f7d6c60ce9e8da683a480e3dfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2A556 5176 bytes
font_01_sfnt_off0002b706.bin
d2d041f0fbe0265da1b5b9be93b9bd43656a9b3ab7d70a6a8574901fa0bb2542		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2B706 14784 bytes
font_02_sfnt_off0002e581.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E581 16204 bytes

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