Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ac340fd7c3354a…

MALICIOUS

PDF

78.9 KB Created: 2021-04-24 14:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65d845e257300685f8c7e7a2f8a14668 SHA-1: 7f236db8c567bd440c8d0de5d9d4df530482e768 SHA-256: 48ac340fd7c3354aeea91e3e089944f73ff99e373d6685c49497291937184053
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed for SEO manipulation or malicious redirection. The document body, though heavily obfuscated, contains a lure related to 'how to screenshot on lg', which is likely a pretext to drive traffic to the malicious URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://pelibifir.ru/strik?utm_term=how+to+screenshot+on+lg
    • http://rusakova.space/new_york_city_bike_map_art36wnp.pdf
    • https://jubekese.weebly.com/uploads/1/3/1/6/131606730/43213.pdf
    • http://bamefidev.mygamesonline.org/69020200345.pdf
    • https://cdn.sqhk.co/xinulezebi/je6YhdQ/ascend_math_flash_cards_multiplication.pdf
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/7dfa442.pdf
    • http://kittyplay.online/as_a_child_of_god_i_amxyrpt.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://copyrightsupportforlnstagram.com/moregovolulavafasurun3mdc.pdf
    • https://cdn.sqhk.co/femelofep/Sia4aSc/world_nature_conservation_day_2020_quotes.pdf
    • https://cdn.sqhk.co/jigugabopu/SQjaPsh/road_rage_epic_shooting_milwaukee.pdf
    • https://zumuwezejulo.weebly.com/uploads/1/3/1/4/131455722/57902f1cc96e.pdf
    • https://cdn.sqhk.co/vipujitebiki/QJYjaXy/kejeruboderugapexogiwel.pdf
    • http://womuvizitina.mywebcommunity.org/web_analytics_avinash_kaushik.pdf
    • https://fapusazi.weebly.com/uploads/1/3/4/8/134849501/voted_gusomirabe_vevizevegujafop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/629f5971-8887-462b-a37f-0688c41fbc6b/h20_mop_x5_replacement_parts.pdf
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_6c79be2b6a0745399e2f5ced0fdd82b9.pdf?index=true
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_12cfac4b6c0a496e95620cd0eabc6c1f.pdf?index=true
    • http://vimixof.onlinewebshop.net/el_juego_del_ngel_de_carlos_ruiz_zafn.pdf
    • https://uploads.strikinglycdn.com/files/96f07aaf-bb3c-477e-94c7-e2ce56e11b6a/sharp_cash_register_xe-a102_ink.pdf
    • https://d1e6aceb-f258-402f-b59e-92ecb386693c.filesusr.com/ugd/2cc58f_d9f358704ce441a1bf884177f3137746.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3aaaffb0-740a-4d13-a157-b22127a668c8/bunn_cwtf15-aps_pf.pdf
    • http://zujakogi.onlinewebshop.net/allegory_of_the_cave_explained.pdf
    • https://uploads.strikinglycdn.com/files/cf6b5651-6c18-42df-b573-33417c9add6c/wemozuso.pdf
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_856a42940143412e87a89d85e70b6a39.pdf?index=true
    • 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_off0000f57c.bin
bd187b8713966b20409bf67a8d1d84417251b094f354ce9a9f54993a6e016d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 4904 bytes
font_01_sfnt_off00010635.bin
5358177601b7ca18662ec6a9f134e56449857f92b8f55571ac4dc39661280e93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 12076 bytes

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