Malicious PDF — malware analysis report

Static analysis result for SHA-256 103db18a0787bd34…

MALICIOUS

PDF

79.2 KB Created: 2021-03-08 11:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 252b7b2f769a1d5f1287ffc3e83e71af SHA-1: 89fd6eb50f2e5a1a9e67697be119339731ac18bd SHA-256: 103db18a0787bd34b202979d34c2d5e0c27daef75899ee1b0aa48c232b996c54
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/award?keyword=scanned+pdf+text+editor+online+free PDF link annotation
    • http://rukozhop-guide.com/nixafunafezuzudezeropovdkjl7.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/hp_officejet_7110_a3_problem.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/aBzkuie/foxone_advanced_edition_apk_free_download.pdfIn PDF document text
    • http://daxavepevepa.mypressonline.com/shogun_2_christianity_benefits.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/vRifhjd/26622843106.pdfIn PDF document text
    • http://wiinorama.fun/vobesiruxots9no.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/OQuNjb2/head_soccer_laliga_2019_hile.pdfIn PDF document text
    • http://sweetmeet.online/803754818605dn52.pdfIn PDF document text
    • http://tublitalia.fun/does_uracil_replace_thymine_in_mrnajtmiu.pdfIn PDF document text
    • http://fikakutipid.mygamesonline.org/29585517115.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/debotofibusibe.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/what_kind_of_hydraulic_fluid_do_you_put_in_a_log_splitter.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/what_is_sisterhood_to_you.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/RJLVCqn/89464954098.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/baumatic_washing_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/maplestory_chaos_horntail_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a7ac45-ffe2-4437-8f39-d1f9b9b58744/how_to_write_chinese_characters_stroke_order.pdfIn PDF document text
    • http://tediguku.atwebpages.com/46341098470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2c82db-f894-4d9c-93d6-26b9d6dc5355/vapour_absorption_refrigeration_system_works_using_the.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655ce37d-40f2-48ea-ab06-0e14d40b50f4/club_car_precedent_maintenance_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1233b4-8f50-4e25-8eae-43893f13f42c/womivuxolusidofifevagep.pdfIn PDF document text
    • http://jifisuxevizek.myartsonline.com/1652801275.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_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 5144 bytes
SHA-256: 6d7908e0fac2357f1b64fdc91f7d83db02bfd70937fd84990f95a9f1eb245c8a
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 11028 bytes
SHA-256: 05e7aeeef1c319ca1632732bcd35bf3905c6be594af8093abcac47e2892dd494

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