Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c85e28a40e2ebd0…

MALICIOUS

PDF

82.0 KB Created: 2021-02-22 17:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 83acc3113a9056e0559f13bc003f0500 SHA-1: 5d5199ae30ebe43c702b89c68f5fb184e34e8fcd SHA-256: 9c85e28a40e2ebd022fcf301741d6d5b267ed8b6d2214ad41b6662de7219b1ed
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'Howl's Moving Castle Book 2 summary', which is likely a pretext to drive users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

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
  • 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://bologen.ru/123?utm_term=howl%2527s+moving+castle+book+2+summary PDF link annotation
    • https://cdn.sqhk.co/wujejelot/gf08eTT/52939382705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_602aa9b088dbb.pdfIn PDF document text
    • http://kitufavurakural.iblogger.org/addition_and_subtraction_worksheets_ks1_tes.pdfIn PDF document text
    • http://paximosikelos.22web.org/bassinet_fitted_sheet_adairs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486965/normal_5fff3cab87db6.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/LJ6sihN/saudi_royal_family_tree_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lisojikefe/WmggYCf/zombieland_saga_season_2_release.pdfIn PDF document text
    • http://mafuditovu.iblogger.org/weluwuw.pdfIn PDF document text
    • http://trastqort.online/67206301525n8p23.pdfIn PDF document text
    • http://julubavixukab.66ghz.com/60844466118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_5fd9017bd076a.pdfIn PDF document text
    • http://help-business-media.com/anatomy_trains_bookxbp89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393900/normal_5fc56f934fb01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506170/normal_5fcd71d5ab8a8.pdfIn PDF document text
    • https://cdn.sqhk.co/vakiduju/hiiLjdL/business_analysis_tools_and_techniques.pdfIn PDF document text
    • http://ayazshabutdinov.club/vukikutulunimebojog7vxct.pdfIn PDF document text
    • http://bepegut.iblogger.org/what_is_the_wps_button.pdfIn PDF document text
    • http://itabody.space/upsssc_junior_assistant_548_notificationkwi98.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
    • http://rigirulame.epizy.com/jituri.pdfIn PDF document text
    • http://gebuzabode.epizy.com/19106315220.pdfIn PDF document text
    • http://zobemodorujo.rf.gd/59851699476.pdfIn PDF document text
    • http://simipibenafar.epizy.com/46885374037.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 3732 bytes
SHA-256: 2abd7bdfad454fbbc5ebf51ee860e66ab3d455c6d9d37c1a4856f1bb84a0a510
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 5584 bytes
SHA-256: 721b5694f0101a9eab34542335dcce28c732c77a0cee46b0d34f645f72a63e77
font_02_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 10828 bytes
SHA-256: f820c78c4878347374e41f7c80ff786209aaaca5b7319fc7e3323001ffa1cb92
font_03_sfnt_off00012bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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