Malicious PDF — malware analysis report

Static analysis result for SHA-256 1427ec186c08fa80…

MALICIOUS

PDF

67.3 KB Created: 2021-03-05 03:08:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dceede45ac008565d50d9e8354875077 SHA-1: adb314c17f4a259fe385f6c1965a5dcea842417c SHA-256: 1427ec186c08fa805b729d3a5b416a9dc15c2a945440b60a1ebff292a817c6d3
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to known malicious redirectors or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a book title, likely to trick users into clicking the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=data+structures+using+c+and+c%252B%252B+book+by+yedidyah+langsam+pdf In PDF document text
    • http://tidirakozodawon.getenjoyment.net/57439087626.pdfIn PDF document text
    • http://zakazuvanadoze.66ghz.com/archived_messages_gmail_android.pdfIn PDF document text
    • https://xumebarukez.weebly.com/uploads/1/3/4/6/134687090/89f0b0bd0a815a8.pdfIn PDF document text
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/706012.pdfIn PDF document text
    • http://bighome.space/spotify_beta_apk_gratiskpisx.pdfIn PDF document text
    • http://ek-arenda.ru/magisterial_vs_radical_reformationtx1ex.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/bostitch_rn46-1_diagrams26ed.pdfIn PDF document text
    • http://verification-help.com/samsung_galaxy_s9_plus_screen_protector_nz0jcci.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/lekeribqj8w.pdfIn PDF document text
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/bofupojotopitokuk.pdfIn PDF document text
    • http://virutezofulodud.iblogger.org/kenmore_front_loading_washer_error_code_le.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/apostrophe_exercises.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wififeju.atwebpages.com/29661938631.pdfIn PDF document text
    • http://wukobokako.rf.gd/5e_dm_screen_online.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/b.tech_mechanical_engg_jobs_in_chennai.pdfIn PDF document text
    • http://girofili.myartsonline.com/bimokex.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_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 5876 bytes
SHA-256: 033ed573acda25da63e2f1ea0f022de7da88d4887215c884af55226d6ad4607f
font_01_sfnt_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 9804 bytes
SHA-256: 0aa10de645e5273b4eb09358f518ba89949dab407b83277f0aa492efa868556b

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