Malicious PDF — malware analysis report

Static analysis result for SHA-256 49273e4d303310ed…

MALICIOUS

PDF

72.1 KB Created: 2021-03-09 00:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c3ac020a9118c14b2addab8c34dc2f3 SHA-1: 5353df0d1064698d83045bcab8f5908e80e976d4 SHA-256: 49273e4d303310ed17711914eb47619f74311e83e5c0c766ed01a1ee2a2d92d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by a machine learning classifier with high confidence. It contains a large number of external links, indicating a potential link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it is designed to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=kinh+tin+kinh+hoai+duc+pdf
    • http://iclod.tech/dell_optiplex_3010_graphics_card_installation4w6ak.pdf
    • http://suraneb.scienceontheweb.net/kenetukebutusos.pdf
    • http://milktree.store/fotirenerapovepwzf0g.pdf
    • http://nat-fru.space/736897970032x54k.pdf
    • https://cdn.sqhk.co/sejixikerut/ghcjb9q/betebepedegirivifugexu.pdf
    • https://cdn.sqhk.co/rajosibakulu/c6S4jbz/free_slots_no_download._com_aristocrat_5321-_buffalo.pdf
    • https://cdn.sqhk.co/tusadopovet/jhaYrWE/fashion_all_star_jersey.pdf
    • http://fsbsiod.com/where_to_purchase_tracfone_sim_cardxgxer.pdf
    • http://rawoxaxevog.mygamesonline.org/can_you_cook_gammon_on_a_george_foreman_grill.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_24407769a7834e5e9ad57508c6e7686a.pdf?index=true
    • http://telusomabufa.onlinewebshop.net/15980436454.pdf
    • https://uploads.strikinglycdn.com/files/fe102e10-8510-41ec-8b7b-8fdf875ae317/37516653940.pdf
    • https://uploads.strikinglycdn.com/files/b43790a9-4cd6-4939-b640-8a271886acd9/international_mail_cost_calculator.pdf
    • https://uploads.strikinglycdn.com/files/2229271c-23ca-46cc-989e-0b5a75eb3547/78252591211.pdf
    • https://uploads.strikinglycdn.com/files/dfe550cc-0b2e-4582-89a7-d9caea1e72ea/63621188096.pdf
    • https://uploads.strikinglycdn.com/files/989e60f2-4cd8-46cf-a392-7c464469ae33/focusrite_scarlett_18i8_2nd_gen_driver.pdf
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_39d40678920c437ea988fdc5b98ce992.pdf?index=true
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_f6b054266b6b49c887858853f3e74e3f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b5c5c4a9-ac84-43f3-8e46-203875c87dd8/how_do_you_reset_the_ice_maker_on_a_whirlpool_french_door_refrigerator.pdf
    • https://uploads.strikinglycdn.com/files/65110833-6a2f-48fe-a24a-8b7b32747f05/samepulaxopipofenoz.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_off0000de0c.bin
6ecb016d666614c79aa843acb5b317f542bf000d23728d773d0b26f2c0622233		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 4968 bytes
font_01_sfnt_off0000eefa.bin
1146a30c4e699402563cdb178ceffaffdf810cd1f5e813fc4c1c551f957e0a5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 10548 bytes

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