Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c81b3edc47151c0…

MALICIOUS

PDF

90.5 KB Created: 2021-05-17 04:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a3dc6c32187f3b4e775627483ae12eb SHA-1: b16723f592fecf72eba2d3f857ef5b3e38a78c4e SHA-256: 5c81b3edc47151c0b74a229d2f1f0e5b47004f919256761ce755d4d34dcabdd3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a large number of external links, with one identified URL being https://nipisod.ru/strik?utm_term=price+of+bowflex. This suggests the document is designed to redirect users to potentially malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=price+of+bowflex
    • https://cdn-cms.f-static.net/uploads/4421199/normal_60680defc3ae9.pdf
    • https://cdn.sqhk.co/wasuxuletiz/4jgjfja/eastern_promises_imdb_parents_guide.pdf
    • https://cdn.sqhk.co/viwiratoposu/Tjefght/22421371396.pdf
    • https://cdn.sqhk.co/lonuxonemor/ibhclSK/plague_inc_board_game_scenario_strategy.pdf
    • https://cdn.sqhk.co/mibemofega/gc0hggP/warframe_protea_farm.pdf
    • https://cdn.sqhk.co/jekidase/hdRa1jh/zexepotive.pdf
    • https://static.s123-cdn-static.com/uploads/4388427/normal_5fe534d5a78a8.pdf
    • http://rowowesofazov.medianewsonline.com/bible_atlas_free_download.pdf
    • http://help-copyrighteamservice.com/new_product_announcement_email_templatekn58z.pdf
    • https://static.s123-cdn-static.com/uploads/4369160/normal_5ff76456b1fac.pdf
    • http://rentline.pro/xexelojijokeziduju595wr.pdf
    • https://cdn.sqhk.co/joduragenep/duDhaNf/shadow_the_hedgehog_human_minecraft_skin.pdf
    • https://cdn.sqhk.co/dojidavos/iiia0V8/ruxigodiximewininerumid.pdf
    • https://cdn-cms.f-static.net/uploads/4474448/normal_60304f019dbbe.pdf
    • http://bullbananavannaone.xyz/caperucita_roja_y_el_lobo_enamoradopmxpu.pdf
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdf
    • http://kprovk.xyz/zujuvikonelofibiwagimf48s7.pdf
    • https://cdn-cms.f-static.net/uploads/4416786/normal_602be9abe9dbb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_3fea37ac06ba47a99b517283ea1c72dc.pdf?index=true
    • http://bufijonewufo.onlinewebshop.net/moto_x_2nd_gen_frp_bypass_5.1_without_pc.pdf
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_740cbd9f07e8496a8dc7d1e4c8ded1e8.pdf?index=true
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_67a75c08235146ad9621bb8af637796d.pdf?index=true
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_f0ded6ab3adc486ab22fba4372303dc2.pdf?index=true
    • https://57e596f1-a2cf-4e3c-9ba9-dc8e42e7d639.filesusr.com/ugd/1e1da7_339b9ecf5e364cd2984b1065f27a6d2e.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_off000127b0.bin
8240e18d20b07a96d1e26a17f105e3218104c442ff9843e46c0881b36a28f5eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 4788 bytes
font_01_sfnt_off00013826.bin
d5995682aea0e285bde72e0ab7da1c4238269334774c705100f24586e2f8ca55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13826 10768 bytes

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