Malicious PDF — malware analysis report

Static analysis result for SHA-256 caaf39b93d4f1505…

MALICIOUS

PDF

111.8 KB Created: 2021-05-31 16:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 20d4874100fbce43440728387cdd74e4 SHA-1: 17e3f3b6fa3745745feccab293f1e8f933fd71d4 SHA-256: caaf39b93d4f15059258085d78503354430d1c7c32620032735a1e694c1b3250
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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 0.9997

Heuristics 7

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://irlanc.ru/pbw?utm_term=game+ultraman+fighting+evolution+3+ps2+iso PDF link annotation
    • https://jebezefekoju.weebly.com/uploads/1/3/4/7/134737834/4710985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_5fe86cad725db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451049/normal_5fcc14e47ebd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_6012d61fa292b.pdfIn PDF document text
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/2272291.pdfIn PDF document text
    • https://ruzejeparofilag.weebly.com/uploads/1/3/4/5/134582671/dazid.pdfIn PDF document text
    • https://bixizevabusiku.weebly.com/uploads/1/3/4/4/134403351/557893.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://uploads.strikinglycdn.com/files/2427093c-3f38-450c-b236-93b25a8af676/the_greatest_salesman_in_the_world_telugu.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144413496/razonamiento_logico_matematico_santillana.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/sezejejazesuxenusuwulax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ed2d90-07ed-4d6d-94d6-7e0296f8a352/tuvow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ccbbb56-932f-41c2-8f86-60634253b669/how_to_balance_hormones_to_lose_weight_during_menopause.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c927a4-3073-4091-af7f-4fe29e1d4bfe/jazarudapedeketuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5014a0e-58be-44c7-b29f-09d3d1262835/xalunikaxilurofixoj.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144413196/96885001549.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144411678/survivor_39_episode_1_watch_online.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144412791/the_joy_of_creation_halloween_edition_android_download.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144411669/how_to_find_gmail_account_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0086a6-acdd-4ac4-bcf3-e39e869d0f6a/yaesu_ft_857d_manuale_italiano.pdfIn PDF document text
    • http://kekirow.pbworks.com/f/does_sauna_belts_really_work.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_off00016683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16683 5584 bytes
SHA-256: 3579f65e93a8da9b6580ae1043bc8b3070e1cae4688ff7262a3b38b6cb2e382f
font_01_sfnt_off00017968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17968 12392 bytes
SHA-256: c6ebd1d03e25e7b68236b8dde4b5b68040706817136066b3c505d1030f02e62c
font_02_sfnt_off0001a378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A378 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333