Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de6c997cdfe3094…

MALICIOUS

PDF

71.8 KB Created: 2021-01-29 07:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 559d77017ce70624da3965fd9944f584 SHA-1: 522e7f2720717eb12b8c896d4e181a42b47a66d3 SHA-256: 8de6c997cdfe3094999fcd95b0a32e4216212cf19fc576ef60c83270db799954
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to download potentially unwanted or malicious software. The document body, though heavily obfuscated, contains keywords related to game downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wb?keyword=download%20game%20the%20bonfire%20forsaken%20lands%20mod%20apk PDF link annotation
    • http://egosikenclub.com/zupamui71ui.pdfIn PDF document text
    • http://velesvoyage.ru/the_weatherly_guide_to_drawing_animals_dvd_volume_onel9hjp.pdfIn PDF document text
    • http://krokoboko3.xyz/beginner_typing_lessonsbrhr7.pdfIn PDF document text
    • http://alcexpress3.xyz/private_number_caller_id_apky97re.pdfIn PDF document text
    • http://italywom.space/warhammer_40k_chapter_approved_20183al17.pdfIn PDF document text
    • http://homiak.fun/79291625360ms1rj.pdfIn PDF document text
    • https://dexajuvado.weebly.com/uploads/1/3/4/4/134470202/80830c75126.pdfIn PDF document text
    • http://natorg.fun/harvest_moon_grand_bazaar_guide2lu5s.pdfIn PDF document text
    • http://turajenapadefo.22web.org/60886988214.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/6696448.pdfIn PDF document text
    • https://jekotufuwin.weebly.com/uploads/1/3/1/4/131406020/telazeve-dipulabepisap.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/jgjgj5B/upper_respiratory_infection_definition_medical_dictionary.pdfIn PDF document text
    • https://sodikisug.weebly.com/uploads/1/3/1/4/131437766/pikuzilazuf-zenejuze-rizaxupemudil.pdfIn PDF document text
    • http://cancandance.org/brainsonly_newsday_crosswordmofbw.pdfIn PDF document text
    • http://introdom.ru/i_am_one_with_god_meaningfj1v6.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/igjhhfA/adventure_island_classic_play_online.pdfIn PDF document text
    • http://fimajixilozile.22web.org/tozapubumimedisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lizolubemerawi.epizy.com/schwinn_biodyne_220_manual.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_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 5748 bytes
SHA-256: 3c7e21b32bd04da86223a6cedb40c80406479eb068bea021c9ecb2bd5f02f66e
font_01_sfnt_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 2248 bytes
SHA-256: 8b88185fb1caa19b127db774f1e773b8ec41d1394bc7b72cd727186061f48d9d
font_02_sfnt_off0000ed0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 10624 bytes
SHA-256: f2a0223701b5b8244a8f3609b21cab0a97f0ab7715c8c191ac99a61ba3b82b6b

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