Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f77c3c73a287eb…

MALICIOUS

PDF

82.2 KB Created: 2021-04-02 22:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1608ddf9001d0e91c66b44cfa68587a5 SHA-1: c6cf99ae2a5f7e64a6250ed476a071bb826d60d2 SHA-256: 20f77c3c73a287ebf77e5e3541c0b38d73c9b48620c83a76b08b06940e3a2fb7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/strik?utm_term=mental+status+exam+template+printable PDF link annotation
    • http://weareanonymous.org/how_do_you_draft_a_legal_memorandumy33va.pdfIn PDF document text
    • http://ver-alex.website/redeem_dunia_games_mll0hw2.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/51748789998.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/hdgdZyY/90167471751.pdfIn PDF document text
    • http://fringigejy.site/kodak_esp_3250_wirelessr5tnu.pdfIn PDF document text
    • https://cdn.sqhk.co/mimesima/hhGieME/cartoon_hand_3d_model_free.pdfIn PDF document text
    • http://rowewuxeg.getenjoyment.net/caquexia_neoplasica.pdfIn PDF document text
    • https://cdn.sqhk.co/fapiwejagiz/jisWhjO/pavorojez.pdfIn PDF document text
    • https://cdn.sqhk.co/pemiduwegam/ijehbGw/stranger_chat_app_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/hSierP2/farm_master_ride_on_tractor.pdfIn PDF document text
    • http://vosojivaru.mypressonline.com/ccna_200_125_download.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/jjEHEhc/40447530014.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/ijdidIh/easy_mandala_coloring_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/jE3Uhbr/warframe_defense_avionics.pdfIn PDF document text
    • https://cdn.sqhk.co/roweziwamu/gjhcLiG/pipizavifap.pdfIn PDF document text
    • http://irisca.online/vixigexivokunevopaketipun0g4r6.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/tatalaksana_atresia_esofagus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_a1c0528ceec34c53ba60de2071bf1524.pdf?index=trueIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_2b5153aab95544389b8522e3b405bf1a.pdf?index=trueIn PDF document text
    • http://movuzawizigevej.myartsonline.com/recursion_tree_method_for_solving_recurrences_examples.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_847e1f67d0f54566adb41c84f174b963.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_721e29f4ac98499fbd264ede994c6b51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/bipominedukiwatufu.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/cnc_fanuc_programming_software.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_f9d7f259271245db98a5d30d89c49bbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/97116358342.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C4 4952 bytes
SHA-256: 3e2ab65b93c41b06f8e856d14f960c40c7979d53eb2cd1b3a5c914d4eeddbc12
font_01_sfnt_off0001087d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087D 10592 bytes
SHA-256: 54ca1dd061b68d63642135e3a221b059757378607ee37c3429974d27eb920a82
font_02_sfnt_off00012cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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