Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b446c885ecf363…

MALICIOUS

PDF

76.9 KB Created: 2021-03-29 03:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 455e7ac930015192b98b1634cba5149d SHA-1: 5d61265051c2e773992b7e751bd7ea1f6737c78c SHA-256: 65b446c885ecf36367ca7780a0ab0d14af229c31eca34bc7d72292cd6de18d2c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one specifically appearing as a lure for an 'employee accident report form'. The presence of external URIs and a link farm heuristic suggests the document is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jacksth.ru/award?keyword=employee+accident+report+form+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454665/normal_600691ee22d83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491153/normal_605d911834e97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_601f869a12888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_5fdb0cb393af1.pdfIn PDF document text
    • http://znakomstva69.space/classic_leveling_guide_undeady9pr8.pdfIn PDF document text
    • http://okstore.info/16020989984l62ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386828/normal_5ff17c7d1a3f6.pdfIn PDF document text
    • http://lg-copyright.com/kesomifibo7disv.pdfIn PDF document text
    • http://ergors.space/cyberghost_free_installeroh2o4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_5fd6fbfe3401c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_602da0eb9c85a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_60243acebf63c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_6058049e478d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_5fd8db688ed17.pdfIn PDF document text
    • http://classkaod.ru/puxogaraz3nkno.pdfIn PDF document text
    • http://seamanygau.best/38885776518bjp8p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375705/normal_5fe3ba5b67586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380076/normal_5fc9795924e3e.pdfIn PDF document text
    • http://allrecipes.pro/wheel_size_bike_computeruxusj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_600f641145e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462688/normal_605dc1d5a27ba.pdfIn PDF document text
    • http://lavka-karamel.ru/simple_resume_format_download_in_ms_word_for_studentsoqccc.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/benuka/division_of_positive_and_negative_numbers_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/vazulukuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/dometic_penguin_ii_heat_pump_13_500.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/bethena_a_concert_waltz.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/sediaan_apus_darah.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_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 5180 bytes
SHA-256: ec29f4e57a7aa94beaf0ab02ada8cedfc710fb7dbcafa3654d495bb878cf0861
font_01_sfnt_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 10900 bytes
SHA-256: 5f0a4c393e2f8fa59098fabfe54b39882d1013268ff832d7f7e46df64e2caf51