Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1dac597f5b08e8…

MALICIOUS

PDF

84.3 KB Created: 2021-03-10 16:53:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9cca6b933570eaf17f84b9227ad0c280 SHA-1: 9f91854144e7354fe270ff07c1770c038bbc6072 SHA-256: ad1dac597f5b08e836237b72a1c65bc9f300692bb75cfbf9777aab82de1d4c59
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL observed is https://gimoguvi.ru/award?keyword=compliance+risk+management+framework+pdf, which appears to be part of a SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://gimoguvi.ru/award?keyword=compliance+risk+management+framework+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454430/normal_604206a69866d.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/GggjiVn/joweledinepek.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/3hfVjhQ/pifumijotuborux.pdfIn PDF document text
    • https://rujuzodojavumip.weebly.com/uploads/1/3/4/7/134726220/zitidago-vivavosafasaw-lugozasijufeza-buzowasuw.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/lkPaia0/heroes_of_dragon_age_purple_characters.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/dukipo-duvilabevag-rapabibeginur-najuxemurix.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/mitanurironoweziv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380692/normal_5fcd28b102eae.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/jobesenuj.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/8Yjjwia/vomefaxagobamiwal.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/hcjfjjg/image_composite_editor_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/U2QUtie/runtown_emotional_free_beat.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/3BlGIOy/word_search_puzzle_generator_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_694775caca43426a9c225041c8c44a34.pdf?index=trueIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_f257b7eee8ea4ce5b211a9bb3611ddf9.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_2e304453e00b4f8c8af7c2943c323a2d.pdf?index=trueIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_cde3810cdbec43c3bde82480e1b6df0d.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_ba4d5e0e004c4b5dac1e19dd6fffabfa.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_413f960c2f3d46be810336f8956a13aa.pdf?index=trueIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_31ada3df68d34dd59496a726598767e0.pdf?index=trueIn 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_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 5536 bytes
SHA-256: ae9a7fe733d9fb9fe53c5cdfb61c067deea6e59d83864817e3da0bff8fd1fc8c
font_01_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 11048 bytes
SHA-256: f85aa3961d77eff4020fd8e426aed696623917b38b7eb8951915ee3ca33a7eca