Malicious PDF — malware analysis report

Static analysis result for SHA-256 45806293f2cdc37f…

MALICIOUS

PDF

69.2 KB Created: 2021-04-05 16:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2332f59147362e72c4dbc1f51613b8e9 SHA-1: 8ab2b4f2694a0b6f89db2937c7a0ea05732fc0b6 SHA-256: 45806293f2cdc37f91518f29e4d8c4d24c81ef884f7dd037fee7933490f2443e
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 numerous embedded URLs, many pointing to disposable domains, which are characteristic of link farms used to distribute malicious content. The document body, though heavily obfuscated, suggests a lure related to 'Amc 8 2019 answers', likely a pretext to drive users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/wix?keyword=amc+8+2019+answers
    • http://susekilimu.medianewsonline.com/6469216089.pdf
    • https://cdn.sqhk.co/busanurutar/RzgfHBN/pudabelovujet.pdf
    • http://netewe9.xyz/star_trek_adventures_command_divisiok6a6j.pdf
    • http://kuboduzuke.mypressonline.com/academic_word_list_download.pdf
    • https://cdn.sqhk.co/bemovunilupo/gcf2Th3/oddmar_android_controller_support.pdf
    • http://pidawudimo.scienceontheweb.net/public_financial_administration_noun.pdf
    • http://item-get.top/13701373495mjyg0.pdf
    • http://tikanaw.mypressonline.com/sharad_upadhye_books_marathi.pdf
    • http://nosumiva.mywebcommunity.org/nazeberijinigeviw.pdf
    • http://luxabedeluzop.iblogger.org/estres_y_afrontamiento.pdf
    • https://cdn.sqhk.co/datolabevev/dlAidjb/braid_salon_los_angeles.pdf
    • http://paxezot.getenjoyment.net/23069782036.pdf
    • http://kugewezebuvigiw.mygamesonline.org/yankees_2020_printable_schedule.pdf
    • http://tendernes.ru/3966960573336nq6.pdf
    • http://ledy66.net/safety_not_guaranteed_movie_cast8ffoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tomijejimener.epizy.com/ranibemoxesuzojamitetego.pdf
    • http://jilutuve.rf.gd/item_shop_pro_game_guides.pdf
    • http://kezasifofajimo.rf.gd/89559354092.pdf
    • http://kopolug.myartsonline.com/lekobafuzemujobifogekalik.pdf
    • http://redifigikutusoj.myartsonline.com/carillas_de_resina_compuesta.pdf
    • https://uploads.strikinglycdn.com/files/d95e44e9-a53e-4b56-9a5e-ff8982f770cc/59539798367.pdf
    • http://zivomunigewelo.rf.gd/72778298963.pdf
    • https://uploads.strikinglycdn.com/files/59624fca-4d9b-46dd-9009-422c15acc2f6/samsung_mono_headset_hm1350_manual.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_off0000cc9d.bin
7cfe564e82ecf9708cb62c3c9aff3eed5212f48f247f903317f2ecfb379e2fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9D 5668 bytes
font_01_sfnt_off0000dfee.bin
93d956f3a8cafcb49645eb8acd0e7b172efe24874f027705a29afb938fe48a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 11352 bytes

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