Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb4f6d175246892…

MALICIOUS

PDF

94.9 KB Created: 2021-03-25 23:51:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9db0d18002866d5212a29d28d07b17a0 SHA-1: 9a8760b8fabc835be597069f5499b3d308388bc0 SHA-256: 0cb4f6d175246892a30613e565d591d9460c656e476ec2dd192f816cde841a2f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The document body, though partially corrupted, suggests a lure related to English verbs, which is likely a pretext to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/aws?utm_term=5+ejemplos+de+verbos+irregulares+y+regulares+en+ingles PDF link annotation
    • https://cdn.sqhk.co/guranotup/gjzVigM/mp3_music_download_hottest_playlists_and_songs.pdfIn PDF document text
    • http://prognoz-football.club/19186639326uhdwj.pdfIn PDF document text
    • http://idealsit.fun/78775133584b4bhq.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/hETgiii/mekedaxono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_6027ab6b7fb2c.pdfIn PDF document text
    • http://springwin.space/bilusokatiguvisom4kw4v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_60560572156b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_6028ac36575a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_60582b2442910.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22852a8-f30a-4a8c-b12b-4ff23ffd355f/80194885010.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_de3cb117cb3a42138a0ea27a2ed12d29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaac5a6d-ec43-4d30-88f1-6781424748f4/fedadozokodadofexubip.pdfIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_851c8724d164411fa85b4b8526044e24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/xadetasupi.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/62196544978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578a14f6-fb4b-4523-8d4a-f95aaafe5831/infinity_gauntlet_thanos_marvel_legends.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/java_jdk_for_32_bit_windows.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_c96e176705f54831a9ff561037d2886b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divikufifir/97465148148.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/lodomixe.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_6d4906b426dd446d840777588e98d322.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec48af02-3fbe-4ec5-af08-d2c112aad8ed/insinkerator_evolution_compact_garbage_disposal_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd64e2d-eba6-439c-8d54-bb8b03b9f74b/cerita_film_the_hunger_games_mockingjay_part_2.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_off000129eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EB 5688 bytes
SHA-256: 869f852e81f7b1bab2a6abd4459d4acbc9dbe4477c6cd47fa891437588097f09
font_01_sfnt_off00013d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D33 15308 bytes
SHA-256: 9b0c2ce8a2931bd08b4c1ee968523b17886265db7e6928b2b7125916db37da14