Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba4731d6a8a7602…

MALICIOUS

PDF

87.0 KB Created: 2021-03-27 22:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6cc4d72fdc199bb3effac2df06188f7e SHA-1: 2b841db9aeae70ac9efc2950fcf5264f6cca2bf4 SHA-256: fba4731d6a8a76024ed78fece656774c8989c7c8ddf78b77bddb641695d0d75b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, indicating a link farm designed to distribute or host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the structure and embedded URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://bologen.ru/award?keyword=belgariad+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446036/normal_5fd9af6306829.pdfIn PDF document text
    • http://fisidijomufuto.22web.org/toeic_answer_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/07hggdS/hardest_level_mario_maker_2.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/thinking_fast_and_slow_audiobook.pdfIn PDF document text
    • http://xoselugubo.22web.org/sultans_of_swing_guitar_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369781/normal_6001749bbe632.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/811110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_60486ae75cfde.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/juraxedowexatomopedozede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498801/normal_602edf7e65079.pdfIn PDF document text
    • https://cdn.sqhk.co/dokamaruxif/ODiguie/gold_glass_tower_shelf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496005/normal_6000d08c50948.pdfIn PDF document text
    • http://regetun.22web.org/dungeon_keeper_mobile_strategy_guide.pdfIn PDF document text
    • http://xugilerasifoveg.22web.org/the_heiress_chinese_drama_ep_13.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/fft0did/xodorelenusexigeluderusox.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/5433945.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://jedabotuz.epizy.com/hormon_auksin_adalah.pdfIn PDF document text
    • http://zogizas.rf.gd/avital_ronell_stupidity.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_off00010be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 4880 bytes
SHA-256: 3b1848ff0a31910dd9acecb9bfcce92bb7a72f4b7a0e1107a9a03588f3e030d6
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 10768 bytes
SHA-256: 5d9e22828db4bce62291de826c36e72653a899ae41f22fea1a5e5308e7127ed8
font_02_sfnt_off00014119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14119 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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