Malicious PDF — malware analysis report

Static analysis result for SHA-256 782070b70978d7de…

MALICIOUS

PDF

84.7 KB Created: 2021-04-03 08:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fd557799b27f8fcb154bb54b5e1c5040 SHA-1: 598a934ad7ac33317d4d5de635220ffecd5ecd7f SHA-256: 782070b70978d7de48e2554df4ebf8ac58a64d2f685a1cc7148e9bc3ba5ef1da
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://druttle.ru/award?keyword=forward+caste+list+in+tamilnadu+pdf PDF link annotation
    • http://alexandreablog.com/graphic_artist_jobs_san_diegoqwbag.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/riludovumawiluk.pdfIn PDF document text
    • http://tvoyoproc.fun/follower_manager_ig_reports_apkxnq4q.pdfIn PDF document text
    • http://all-casino.xyz/mitu_meetrit_100_ruutjalga_kohtau8wlb.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/jjhbKGA/facebook_logo_for_business_card_use.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/1Zha2ii/galaxy_watch_2.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/fuBieiv/youtube_vr_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/gLibbGr/lepadijodudewo.pdfIn PDF document text
    • http://arfeshome.com/darukakrvhxg.pdfIn PDF document text
    • https://cdn.sqhk.co/baziwuwe/digbgeY/formalist_theory_in_literature.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/hgjghjF/du_browser_mini_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/9if4ghd/bts_dynamite_lyrics_teaser.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://677e6977-fc43-48b2-ac81-16e478c8573b.filesusr.com/ugd/3750c2_865f0f96027e446e9a8fe725277715f6.pdf?index=trueIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_737fdb65b58146aa84e8e18cb81a88bc.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_63956191a26241fc9b1f2bbdc96ac3e6.pdf?index=trueIn PDF document text
    • http://tubaduk.epizy.com/metabolism_catabolism_and_anabolism.pdfIn PDF document text
    • http://taluxukuvasule.epizy.com/rascal_mobility_scooter_battery.pdfIn PDF document text
    • http://dinazodes.rf.gd/89945575886.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_06030ba2385f4c18b7c593f2c649e9bf.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_677feccac9b64ceb84688ce0c495dfc3.pdf?index=trueIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_03ea4b3898c140f58a242e2822aad327.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_2b733541499147dd936f332130c5ec4d.pdf?index=trueIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_8b627b5b274d4aa5ab97c4af4bef64b8.pdf?index=trueIn PDF document text
    • http://fuxazulofonu.epizy.com/tabela_de_aliquota_de_icms_2019.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_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 5348 bytes
SHA-256: 7df491a09d22913d4540fd2d3dd16fe96a6d6f2a4014315ae04151329bb614e9
font_01_sfnt_off00011fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 10536 bytes
SHA-256: 8e1ec6e0233d7e0a13fc79aa601b57a7fd4d98b14f8cbd30109615aec03dd238