Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5e0d82610b3acf…

MALICIOUS

PDF

71.8 KB Created: 2021-02-19 08:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a69cc01ded1ee1889a73962f34bb58a3 SHA-1: 3bc16501254593863908ba8b204f3976ac51c3be SHA-256: 7e5e0d82610b3acfa901e5b5da79713ced78c57407abf913b69f11c7b8a959b9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to domains associated with link farms and disposable hosting, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, but the structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=rinnai+water+heaters+home+depot PDF link annotation
    • https://cdn.sqhk.co/novupezezis/iibdZIa/zumewedurewewobi.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/a1jagj4/volegikezamo.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/gfjiijn/ludomoguzejasolebilemevud.pdfIn PDF document text
    • http://megantv.site/venev4yama.pdfIn PDF document text
    • http://storeyou.store/yugioh_immortal_destiny_booster_box_card_list274u4.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/ledjdij/extreme_fast_car_racer_apk.pdfIn PDF document text
    • http://bedusopuzal.22web.org/anime_wallpaper_hd_apkpure.pdfIn PDF document text
    • http://whitecheat.xyz/funubogejejoviukds0.pdfIn PDF document text
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/fb079d00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dazesokagevak.rf.gd/grade_12_physical_science_textbook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/walexo.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/another_day_of_sun_trumpet_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/261678317.pdfIn PDF document text
    • http://jejivosijej.rf.gd/zeviwijiluni.pdfIn PDF document text
    • http://zuxamivim.epizy.com/xuwuneriwexolo.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/play_games_online_without_ing_hidden_objects.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/28827062002.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_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 5268 bytes
SHA-256: 5c9b6f74794151f46bffe42635651ca125e0167302efa743a34f212ea043180b
font_01_sfnt_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 10400 bytes
SHA-256: 3d45a3ef61c62a4a46ed07d207b50f843b2dbc37ede916a11be5886d08dde3a1

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