Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa12af42792dab85…

MALICIOUS

PDF

75.9 KB Created: 2021-04-03 05:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d082c532ab8cfe9bf765c8d95b795b81 SHA-1: 75d8fb72cfa5aaff57bb6edfc79355fbbc5a1c0b SHA-256: aa12af42792dab85982d5f9f54abd00c52bf7ff68b922ae09c623e1d40ba1779
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mezovuduw.ru/strik?utm_term=cateye+velo+8+price
    • http://kyponnik.online/bajiwusijajevaminapagufp74po.pdf
    • http://bossyonlinex.com/letter_of_recommendation_for_ms_in_computer_science8h7wv.pdf
    • http://idealica-ufficiale.site/how_to_do_psychoanalytic_literary_criticismxtlgy.pdf
    • http://naturka.space/bevedi6tlyc.pdf
    • http://wozuxel.getenjoyment.net/bernoulli_probability_distribution.pdf
    • http://zevupixikug.mywebcommunity.org/depression_anxiety_stress_test.pdf
    • http://antonioit.space/best_secret_service_movies_on_netflixbidft.pdf
    • http://desawigoxikugaw.mywebcommunity.org/anatomy_and_physiology_of_the_heart.pdf
    • http://rezltml.xyz/mivuximikuwn3hri.pdf
    • http://ganedoxumizaj.sportsontheweb.net/lutewojotedaxarerikomule.pdf
    • http://particulier-societegenerale.xyz/fefexopebikuxevuu0i.pdf
    • http://trysalon.xyz/jizavudevewipujofusigetakzva67.pdf
    • http://submonster.xyz/adobe_pack_subs_adobe_saggarten2bgpz.pdf
    • http://ottics.ru/chapter_8_chemical_equations_and_reactions_study_guide_answers64jry.pdf
    • http://huaweistoreukr.xyz/555253837964vedy.pdf
    • http://webcam-model.online/fituwoduremavowonizjh9mf.pdf
    • http://4bochki.ru/mitubuzimakilim0pzlv.pdf
    • http://cucoupon.info/womejaromulobadotagiluo2olo.pdf
    • http://yozi.store/poboritovolofgs61c.pdf
    • http://segwaywheelchair.ru/how_to_use_volume_on_roku_remote_appdh4vr.pdf
    • http://ch-redirect.icu/repezutikikajunojusavororiosmf.pdf
    • http://scandisvet.ru/14372641421f60tq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/104457b5-2e64-4ddf-a56e-ac9cb97422cc/tom_sawyer_rush_album.pdf
    • https://uploads.strikinglycdn.com/files/b9ff46e2-e908-4826-8008-c9db3154675b/bexenesakazibamekanekuju.pdf
    • https://uploads.strikinglycdn.com/files/8e0df8bb-39a8-4ca3-9976-d10b7b34104c/42419356290.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_off0000d5da.bin
282cfbbcdb99aa6806c4d416f230d58f68f639ba9ffc5b20e8a85e967fc8b568		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 5008 bytes
font_01_sfnt_off0000e702.bin
4a75826950136790fae122821b6d730827e11b03093852c3e7b8d500b4a6031e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 11300 bytes
font_02_sfnt_off00010cc7.bin
159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 16140 bytes

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