Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fe1bb0a65dc997…

MALICIOUS

PDF

83.6 KB Created: 2021-04-23 12:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 340811dcfd327f4374ac3facb1ce790c SHA-1: 38c97afbe32d97fc97de209f6bf8472d91994a44 SHA-256: 87fe1bb0a65dc9977273b9c9f2ed5739e14dc43550ad98bf24f02a0b3fa22f1c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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-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://pelibifir.ru/strik?utm_term=2009+toyota+corolla+tire+size+p215+45r17+xrs
    • https://cdn.sqhk.co/nemoludajedu/ZjehfuB/44391115000.pdf
    • https://cdn.sqhk.co/munuluxel/qCibWjj/93808940313.pdf
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdf
    • https://cdn.sqhk.co/totimujid/bngi74e/god_sim_games_on_steam.pdf
    • https://static.s123-cdn-static.com/uploads/4387218/normal_600205af6bc0a.pdf
    • https://static.s123-cdn-static.com/uploads/4505326/normal_5feb4076ac8f8.pdf
    • https://cdn.sqhk.co/medukukekuke/N9gSjae/4520175269.pdf
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5fc774d432c19.pdf
    • https://cdn.sqhk.co/zadoweferoxe/isR3Yjh/wechat_download_for_windows_10_pc.pdf
    • https://cdn.sqhk.co/mugolino/hgvhaha/diving_cano_island_costa_rica.pdf
    • https://cdn-cms.f-static.net/uploads/4445544/normal_6063cfe13693d.pdf
    • https://cdn.sqhk.co/tajavujexiz/gciAOmU/47014041913.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_16e4809faba940f195edc1680b354aa4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ebdf6537-980b-426a-9409-22884fca0893/icom_2300h_review.pdf
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_625e1f5d61eb49889daea4bea14523c1.pdf?index=true
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_5c8be9bfb30d4e2883ca99102580f46d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/70337d35-7dff-4ee5-ac10-809c27a9881d/47324992003.pdf
    • https://uploads.strikinglycdn.com/files/31ee6576-4603-4262-9a4a-ce7da3aaffad/how_do_i_use_garmin_delta_xc.pdf
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_b1848bd4709341ec89cd9f2293f859b5.pdf?index=true
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_cbb253a15e71447b893dae3012748269.pdf?index=true
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_9da41bb0814f43e2a59d889bcc7d1e33.pdf?index=true
    • https://uploads.strikinglycdn.com/files/74460157-f590-4d45-ba48-9b17dbb0f4cb/ge_spacemaker_microwave_xl1800_stainless_steel.pdf
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_c0fb2d57ee7543f5b881c218a6a26299.pdf?index=true
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_2a79952da6384a2aaeba087fc7ea21a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c8bf8601-cc2d-413b-a718-2ddd7e0a2b13/what_are_the_qualities_of_a_good_science_teacher.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_off0001041e.bin
e2cd15a968a3c529419747c954f582189f4ecb2fc8aa210996ef721bdbad939c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 5824 bytes
font_01_sfnt_off0001182a.bin
96a67bec30d8afa6cd5c0b1d6000d45c021f8907e9adc5bd83513c81a4259552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1182A 11348 bytes

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