Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18860d97537e796…

MALICIOUS

PDF

88.2 KB Created: 2021-04-27 19:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9509def21655d8d1c1979550a47f9967 SHA-1: b19435bd48860181c7b05afed1c16f864f2bf13f SHA-256: d18860d97537e796ced82143da642dd6a0f71e70f01feb752c372c604ff511c9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

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://fokemale.ru/strik?utm_term=upcoming+multiplayer+survival+games+ps4 PDF link annotation
    • http://shishkin-seed.xyz/zedoluzovobizojexibetadiiyg.pdfIn PDF document text
    • https://cdn.sqhk.co/jodariwem/hcibjjw/fan_games_fnaf_3.pdfIn PDF document text
    • https://latabiwot.weebly.com/uploads/1/3/4/6/134612911/5336c683f6e9ed.pdfIn PDF document text
    • http://triple-doska3.club/89508602467vw3ge.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/faxike.pdfIn PDF document text
    • http://rollernefrit.xyz/ct_dot_traffic_standard_sheetsw8mmq.pdfIn PDF document text
    • http://todayshop.website/5458715944h50im.pdfIn PDF document text
    • http://magnifioco.site/75537783362vm0di.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/genhcse/keto_baked_breaded_chicken_thighs.pdfIn PDF document text
    • http://useporte.xyz/autodesk_360_free_for_windows_10ii6kz.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/7684896.pdfIn PDF document text
    • http://mydenverneighborhoods.com/96376645859v2w85.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/jbugjT0/buwisizibazilumazubixe.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/3d7d349a7a59.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/muxozuvalubi/honda_hrx217k5vka_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b22482-fbb8-4bf2-b35e-c32af8ef1bc3/what_is_the_average_salary_for_a_spanish_interpreter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d228453-04d3-45fd-bc19-3dc96dadea18/monster_island_2017_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/tawuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c589b8d6-b1ed-46e9-a140-2ff062424118/twilight_saga_movie_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/90927788178.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/pubeguketofize.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/51988310925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66866f47-a67b-453d-b324-fc2c1afbbe70/junot_diaz_this_is_how_you_lose_her_new_yorker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa958a7-3a5f-466a-b0e4-a8f0d64ee3e3/earth_abides_quotes.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 5492 bytes
SHA-256: 3c67968c8884786be7db2956b2236d8b26a1ee6b7ceb30ebe551117d1c0007f9
font_01_sfnt_off00012daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAA 10924 bytes
SHA-256: 0bc1556a529afcc00f4ba515cdc3cd7cc07145dbb2b78c19d8fcded2e4ecfe2f

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