Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b8304a3d5f6211…

MALICIOUS

PDF

88.7 KB Created: 2021-03-31 08:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8222645d6fe3c39ef731b6a509fd2cd4 SHA-1: 54df15e9407a6ce116bd2c3ff21b89965c8bdcfe SHA-256: 52b8304a3d5f62110433bd3541a864dfd8c5e6eb09f630b0014e507562d42f05
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to a search query, suggesting a phishing attempt. The presence of multiple links and the identified malicious redirector indicate an attempt to lead the user to malicious infrastructure, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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://yafferge.ru/strik?utm_term=why+has+my+dab+radio+stopped+working In PDF document text
    • http://ourfutures.space/xodeguzonakax2n77k.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/hUXnghb/53427761445.pdfIn PDF document text
    • http://fuvilejolo.iblogger.org/why_do_you_need_a_silver_bullet_to_kill_a_werewolf.pdfIn PDF document text
    • https://cdn.sqhk.co/fobojuwof/jgVSpyz/combo_quest_2_apk.pdfIn PDF document text
    • http://trastenmyqort.online/dawovss825.pdfIn PDF document text
    • http://nat-fru.space/112646932576bl88.pdfIn PDF document text
    • http://rakivabe.sportsontheweb.net/18178843092.pdfIn PDF document text
    • http://mgacessoria.online/lolesryi0m.pdfIn PDF document text
    • https://cdn.sqhk.co/xivorotil/dgixihu/62783263984.pdfIn PDF document text
    • http://pizuwujigajanen.medianewsonline.com/electrolysis_of_acidified_water.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://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_7f272c3e72ca4612865d8ae622b3f13d.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_2db4d51f2dc540b3adea5189fc72c092.pdf?index=trueIn PDF document text
    • http://gejaran.epizy.com/zupudoxuwitejanidebini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6655c3a3-95f3-44bc-aabf-464cd176ac5a/turnigy_9x_compatible_receivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a03ae086-4f26-42a1-b5eb-cc279820c434/1230427168.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_5c09f0d87826493c8b42763055013423.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_94f5afd06bdb40eab2ac1c0ace2f696d.pdf?index=trueIn PDF document text
    • http://widurema.epizy.com/suzuxopubaxaridedunogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2da9431-2d65-464e-a439-06c01bab98ec/building_wealth_one_house_at_a_time_updated_and_expanded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3237d3a9-6c86-4d54-8cad-9a12549e2dd4/fijulupediwax.pdfIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_137b7e0461f2419bb5d66d42fb02dc44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2dca029-8b0c-4b40-992b-7a2cacfcc3fc/bunn_cwtf15_series_manual.pdfIn PDF document text
    • http://bipedok.epizy.com/75458758989.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_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 5540 bytes
SHA-256: 3974244baadfc0d9a64c68281072fc01d6f08d9df8f868745571c59b19277fdc
font_01_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 10692 bytes
SHA-256: ac0e09868174ba90fcd08d627b44bc95e0c27585de6cd688f8d11c01cbf2cb3b
font_02_sfnt_off000146ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146ED 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3