Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2070c8c86b640c…

MALICIOUS

PDF

76.5 KB Created: 2021-03-02 20:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 23cb27fa5b3c9bcdaef6c0c92523c052 SHA-1: a50db82032619d52a8fd2a9ae61c68aeca8c4a60 SHA-256: aa2070c8c86b640c5a6bd2be537c21810dc0f62a23c9d723d332ef8728e9a0cc
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, appears to be a lure related to car seats and strollers, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+attach+chicco+car+seat+to+bob+stroller In PDF document text
    • https://cdn.sqhk.co/luwesefizi/GYjhijA/18762978139.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/how_many_books_are_there_in_total_in_the_catholic_bible.pdfIn PDF document text
    • http://dududuw.mypressonline.com/stihl_blower_bg86c_parts_list.pdfIn PDF document text
    • http://pumaguli.scienceontheweb.net/femevowesusoju.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/4icrggL/littlest_pet_shop_horror_movie.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/dns-323_firmware_smb2.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/what_are_the_pros_and_cons_of_tidal_energy.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/alcatel_3l_spec.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/how_to_rig_corn_for_trout_fishing.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/eaton_transmission_fluid_type.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/7nijJX9/56825742724.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/barnett_jackal_crossbow_hard_case.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/what_does_a_baby_boy_mean_in_a_dream_islam.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/how_to_pair_dish_network_remote_to_roku_tv.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/why_are_my_garage_lights_not_working.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/listening_comprehension_activities_for_6th_grade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widifusi.myartsonline.com/migagabepavijipifewexa.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/traxxas_stampede_2wd_vxl.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/g-shock_gravitymaster_ga_1000-4a.pdfIn PDF document text
    • http://livirava.atwebpages.com/play_a_game_of_chicken_meaning.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/2002_ford_explorer_xlt_transmission_dipstick_location.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/al_quran_bangla_mormobani_apps.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 5080 bytes
SHA-256: eb560f54275ec4b8b57a63dbebcbf99a872785489759be2b95e2fadc61956e32
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 10524 bytes
SHA-256: 41ab22453e4a53f00eb8f7c665806fcce662eb8215eb1d10d7418a96ec769d28

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