Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a7ee6b6bf1bae8…

MALICIOUS

PDF

113.9 KB Created: 2021-04-03 02:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dd38b06d8668999399f6030e0dff4c35 SHA-1: 7f5159c9191ba806ccbe1aba928eecdd422a1017 SHA-256: f7a7ee6b6bf1bae8c586cdcd87616bbd05707e6833dc6e6d4376d4d8c3613753
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to lure users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected this file as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=pioneer+vsx+522+remote+code In PDF document text
    • https://cdn.sqhk.co/daxerarugak/neFgeot/como_jogar_exploration_craft_online.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/DBhighg/zitov.pdfIn PDF document text
    • http://monstergym.ru/fazuxowatasiwizemexexigu3n3vk.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/akrWhie/guncraft_zombie_apocalypse_mod_apk.pdfIn PDF document text
    • http://kotebebe.iblogger.org/honda_transmission_rebuild_kit_automatic.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/pawanipol/ie5gcgf/78169282114.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/1waieOg/funny_videos_tiktok_pinoy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/najubu/doctoral_thesis_presentation_templates.pdfIn PDF document text
    • http://zefifimagami.epizy.com/zavudupujajifogof.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/how_much_do_journeyman_welders_make_in_california.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_d85f7965a961481a8eb660c3daac3c0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/onkyo_tx_sr505_hdmi_no_sound.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_58b5681bde6440868ffd28b0d06029f2.pdf?index=trueIn PDF document text
    • http://wizidiz.epizy.com/joleke.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/27112783756.pdfIn PDF document text
    • http://purowubiwebig.epizy.com/canon_powershot_a560_memory_card.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_2955616b372f478dafbfcc156e3b0363.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_b324371d1c8e4e51b1a801d1df2fd823.pdf?index=trueIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_e7d6742e2c7940cf956169c7f2b7e641.pdf?index=trueIn PDF document text
    • http://vibakiwijikilok.rf.gd/jurassic_park_theme_piano_sheet_music.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAA 3352 bytes
SHA-256: 264f1422657ac63a19f5f413e2fde45e5042bff02612596e055a8175cd995ee3
font_01_sfnt_off00016a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A89 5228 bytes
SHA-256: 177ed6396ebd5621de1562d3c3a4ee1244f8da4067cae510870ab52995d4a2fe
font_02_sfnt_off00017c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C53 11744 bytes
SHA-256: 7535367a753892e3975d0ce67358b963582fb5de891e38d3f47733a2d10c6f08
font_03_sfnt_off0001a466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A466 16176 bytes
SHA-256: bdf747542c92e40b04a5371032a651b344d5921efcc7a9b09bb26c01bfd63df1

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