Malicious PDF — malware analysis report

Static analysis result for SHA-256 441e7f3c9f6fe334…

MALICIOUS

PDF

76.1 KB Created: 2021-03-24 12:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81835185d7460c0472d30b3da07a75fd SHA-1: 9f97838cf31d1e90eae17e7dc0479d46c0cfe4c1 SHA-256: 441e7f3c9f6fe334f8c6cc408d395b6a28332bc92a40366265bea99af8a80f89
186 Risk Score

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=k+of+c+fish+fry+near+me PDF link annotation
    • https://kalakibujupe.weebly.com/uploads/1/3/0/7/130740073/03369c6.pdfIn PDF document text
    • https://vuwezamubom.weebly.com/uploads/1/3/0/8/130814902/c797ce4901de2.pdfIn PDF document text
    • http://requiremcgood.com/how_do_i_fix_the_audio_delay_on_my_samsung_tvulrzb.pdfIn PDF document text
    • https://cdn.sqhk.co/xupixawina/cYiibTg/75341593453.pdfIn PDF document text
    • http://modernstyle.pro/what_is_engagement_in_brain_based_learning3umlx.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/are_ancestry_dna_tests_ever_wrong.pdfIn PDF document text
    • http://vsspb.ru/applied_pathophysiology_free40knm.pdfIn PDF document text
    • http://fubikopelemom.mypressonline.com/ganpati_atharvashirsha_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/zimofuzam/4jgujhU/wolupuxarub.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/bum_bag_pattern.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/concurso_prf_2020_edital_em.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_4f2ac979097a482688db76b912792804.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_f24938f310bb415cb5645aec5df10c07.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_24fc30b1764649f0b829d35f8ad15162.pdf?index=trueIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_23c488c4cb4c47e38d4e57a40268b910.pdf?index=trueIn PDF document text
    • http://vujapoguxesak.myartsonline.com/sony_ps-lx300usb_turntable_manual.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_abf9144a062b4f1cb0cad4110dce37ed.pdf?index=trueIn 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_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 5160 bytes
SHA-256: 65631522b98b40b183807526ef58f157f03fcd555b2ef3e831e141881ba6f5fa
font_01_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 11308 bytes
SHA-256: c1756d30e317afb038320accd20c60f0a93b0a3a3ab13063789927c2fd1477b6

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