Malicious PDF — malware analysis report

Static analysis result for SHA-256 1170d2c8f5fb21e7…

MALICIOUS

PDF

76.0 KB Created: 2021-03-31 12:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c28e607e528ce7bbb2d267a08f45c6c8 SHA-1: 703f153dc3a18390e0df74b89bfff7e037f478e0 SHA-256: 1170d2c8f5fb21e7f9276b369f0fb5e6ec103670db59783719b3830da787cb74
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=because+i+miss+you+piano+sheet+pdf PDF link annotation
    • https://cdn.sqhk.co/pinepopowig/ajgeaje/color_island_kitchen_cabinets_paint.pdfIn PDF document text
    • http://lejifip.sportsontheweb.net/detailed_lesson_plan_in_science_grade_5.pdfIn PDF document text
    • http://srakan.space/buwamamoposivejobivepzd1l.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/20684357538.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/switzerland_road_map.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvapolaxaj/gwwiiid/mean_pulse_pressure_calculation.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/astm_a370_03a.pdfIn PDF document text
    • http://vknart.xyz/what_is_cv_in_afrikaans5mmjg.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/jhSyjjk/puwejoxegafefef.pdfIn PDF document text
    • http://trackengine.host/26550974131p4jr1.pdfIn PDF document text
    • http://ujjjrrrrr.space/21042586180xmc7e.pdfIn PDF document text
    • https://cdn.sqhk.co/susorajin/m4hfdW4/jubomose.pdfIn PDF document text
    • http://wacc-cat.org/zetuzezotibe1fq0.pdfIn PDF document text
    • http://kurs1.xyz/afl_football_fixture_2020hcllx.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/hjghzcq/rusowubutupirokemizupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dodarululi.epizy.com/bestiario_pathfinder_espaol.pdfIn PDF document text
    • http://dizujupena.rf.gd/bases_of_power_in_organizational_behavior.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ac41b4-7370-4e33-a303-7bf495fdb294/jemigipokagipefobajowub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b31105-8758-4c76-99d7-1591d6c77994/alaska_drivers_manual_flashcards.pdfIn PDF document text
    • http://tosowepexinuf.epizy.com/wararedoriwunepabuvemuxeb.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/killing_joke_eighties.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_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 5416 bytes
SHA-256: d61397558a91ce1de59bdc421a273b81e7ea65ddfacb090f7eb17acd4169f573
font_01_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 11500 bytes
SHA-256: f2fdbde1a2562fe9d89843e8433611fa893b78ac6435c682d1c0552da926e305

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