Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8614afcdc96981…

MALICIOUS

PDF

78.9 KB Created: 2021-03-02 09:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0a3dcc446b515eb524111add5f214511 SHA-1: da62b87e0eac71acdc9f0bc301d9aaf82b295f27 SHA-256: 9a8614afcdc96981dac6c35fdf17228d1115382286ef8ff8ac855bd0bd0fb4b4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=kenmore+washer+troubleshooting+guide PDF link annotation
    • http://thecaffeinatedstudent.com/how_to_tell_which_hot_water_heater_element_is_badcklmn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459640/normal_6027a07d1b303.pdfIn PDF document text
    • http://winclean-shop.space/the_hunchback_of_notre_dame_ii_madellainepiru7.pdfIn PDF document text
    • http://filemarker.store/toto_toilet_repair_flappermkdpk.pdfIn PDF document text
    • http://zeridizumof.iblogger.org/zuriguxalebopun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385011/normal_5fcd1cba40c9b.pdfIn PDF document text
    • http://josibazuveloj.iblogger.org/56463880074.pdfIn PDF document text
    • http://tryadasert.online/wutaxuzunudexkq0hc.pdfIn PDF document text
    • http://sis-paypal.com/chicago_manual_of_style_annotated_bibliography_exampleafylw.pdfIn PDF document text
    • http://smirno.life/bilagiw5r73g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370089/normal_600984984aa12.pdfIn PDF document text
    • http://lukaruji.iblogger.org/48344702284.pdfIn PDF document text
    • http://vorecan.space/mokunimalizewi84hl8.pdfIn PDF document text
    • http://wanulutipumik.iblogger.org/73235074559.pdfIn PDF document text
    • http://sport-stavki.fun/formation_bartender_pole_emploi605qo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nitovotiroxe.epizy.com/19490186279.pdfIn PDF document text
    • http://kixomeremit.epizy.com/nefejufumigifesesajidexox.pdfIn PDF document text
    • http://nuwenukaxoxigam.rf.gd/wonder_woman_full_movie_in_english.pdfIn PDF document text
    • http://rujosaru.rf.gd/seziviwigunojos.pdfIn PDF document text
    • http://latuwukatagowa.epizy.com/atm_machine_program_in_c_language.pdfIn PDF document text
    • http://gevalej.epizy.com/blueberry_donut_nutrition_information.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_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 5440 bytes
SHA-256: 199750b1dc9b0c4371c9ed329634a515e2cb74f1d6b5f311176a12b2385daaf9
font_01_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 10860 bytes
SHA-256: 6f9a9e8df2d006c98b5552bae2b5ade1211f6d5f87a471e2ce2691f5f80eca87

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