Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f625895377cdda…

MALICIOUS

PDF

95.4 KB Created: 2021-02-27 14:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 17d2d561690e7751573bd92933ff5292 SHA-1: 6f71dcc5c2e0aab4cf657de331078cef5722bdc4 SHA-256: d6f625895377cdda67b6cd5a73f55b0195cbdc4ad61fa36f6b114b9ff8f79734
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or link farms, indicating a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/123?utm_term=systems+engineering+principles+and+practice+3rd PDF link annotation
    • https://cdn.sqhk.co/sopaluwokaja/fWTidEb/fawugovamofutojaji.pdfIn PDF document text
    • http://ipatovaalena.ru/924429969990x98x.pdfIn PDF document text
    • https://gadakuvinud.weebly.com/uploads/1/3/1/8/131871823/kofape_wakow.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/j0iaggM/nfl_top_100_all_time_team_coaches.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/gg5ghhh/tegabuvakokolulegigexukug.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/eidZhbF/video_bahamas_dorian_damage.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/bigeka.pdfIn PDF document text
    • http://ca-manalapan.space/puguzoxakoredabamimozijad3v6u.pdfIn PDF document text
    • http://letxxnx.org/latest_movies_telugu_hdxn51p.pdfIn PDF document text
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/5070660.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/eqs35P4/mma_fighting_games_mod_apk.pdfIn PDF document text
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/48124f96.pdfIn PDF document text
    • http://b4shop.icu/lojupigalotasozltkx2.pdfIn PDF document text
    • https://cdn.sqhk.co/govonesed/jejgjiZ/38663725422.pdfIn PDF document text
    • https://jovovanin.weebly.com/uploads/1/3/1/8/131871717/gijetevejefuge.pdfIn PDF document text
    • https://gewasulupav.weebly.com/uploads/1/3/0/7/130740056/7841847.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/uN8iaNO/28749649114.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/XYTvjc0/forklift_daily_inspection_log_book.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
    • http://xatudoxi.epizy.com/dysfunctional_uterine_bleeding_rcog_guidelines.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 21696 bytes
SHA-256: ff7b2486df093cd71b61698f2ab735498a5c67a545613049a42cb524b160698e
font_01_sfnt_off0001285b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285B 5440 bytes
SHA-256: d414d46c1df3290e700b7b5c49176eb3fe5d060c69196f2754645f3cde08229a
font_02_sfnt_off00013abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABC 11448 bytes
SHA-256: aaa7f5d18da084dbf59519af9e6954f065fbdc5f1d00d9014fab6fd1a4a0c2a6
font_03_sfnt_off0001617c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2