Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83d781adb713bce…

MALICIOUS

PDF

77.4 KB Created: 2021-02-14 08:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 49df94495f1fa6e69d019d060fb190b9 SHA-1: 2eeae831d35d9d4e19a5e863b0355e5bb23e2709 SHA-256: a83d781adb713bce9879ca2f83fedd3500ab82adb691c2f416025b2eb5e9c3e7
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

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/wix?keyword=faleena+el+paso PDF link annotation
    • http://glossywp.online/best_multiplayer_dominoes_appcvtak.pdfIn PDF document text
    • http://zorexodepa.iblogger.org/34274517694.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/zijidugolenegofugito.pdfIn PDF document text
    • https://muxasikij.weebly.com/uploads/1/3/1/8/131872285/9056784.pdfIn PDF document text
    • http://zerkalo-fugicar.website/sample_employment_contract_hong_kong5h2mb.pdfIn PDF document text
    • http://buledumemo.iblogger.org/book_graphic_organizer.pdfIn PDF document text
    • http://papotupeti.iblogger.org/ccnav6_final_exam_answers_2018.pdfIn PDF document text
    • http://hydrofthol.space/neram_full_movie_with_english_subtitlestaqbe.pdfIn PDF document text
    • http://lg-copyright.com/pusitipimikitdncuo.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://nufewaruxemo.epizy.com/baroque_guitar_plans.pdfIn PDF document text
    • http://piredesoki.epizy.com/adobe_flash_player_10._1_google_chrome.pdfIn PDF document text
    • http://faxaxesaxejov.rf.gd/64057069868.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/amor_de_invierno_jazmin_riera.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/7939693216.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/huion_graphic_tablet_driver.pdfIn PDF document text
    • http://wejelinemadagep.rf.gd/paxito.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_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 4332 bytes
SHA-256: 7ec50f8945dadb3c79f4f6ffa29dc984f6e8481b571546dcd7417ba219e6aabb
font_01_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 10824 bytes
SHA-256: db59a41a2cbdd95df9dda44e1b1da1113c09dc2f7ddd5586e7ab570b038fe4f5
font_02_sfnt_off00011b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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