Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aaaff0d6adf21c5…

MALICIOUS

PDF

84.1 KB Created: 2021-04-17 21:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 30f112edcddb8bbebec07510aa11da60 SHA-1: dd5ba3d55205554d36f38bead306518316c9a699 SHA-256: 4aaaff0d6adf21c5b43190af49e968a72538e4e3419205cece8f3d3173c48074
126 Risk Score

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://crophysi.ru/strik?utm_term=how+to+change+address+in+ministry+of+manpower PDF link annotation
    • http://mon-cmb.best/glock_26_gen_4_trigger_pull_weight6il8u.pdfIn PDF document text
    • http://businesshelpservice.com/eye_has_not_seen_nor_ear_heard_nkjvaz8on.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/haheazL/vuwivaragimes.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/3Nrfljg/17773176155.pdfIn PDF document text
    • http://stnold.com/xixulg8kco.pdfIn PDF document text
    • http://fotogodopuxet.iblogger.org/92489186866.pdfIn PDF document text
    • https://cdn.sqhk.co/bikezuku/TYxOfjg/conquest_3_kingdoms_forum.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/how_to_learn_climbinguaolg.pdfIn PDF document text
    • http://neuroncraft.online/husqvarna_445e_chainsaw72sml.pdfIn PDF document text
    • http://nextauto02.ru/what_kind_of_oil_does_a_2011_lexus_rx_350_take9juz0.pdfIn PDF document text
    • http://kusuraluzi.iblogger.org/english_words_of_arabic_origin.pdfIn PDF document text
    • http://meetporte.xyz/audre_lorde_quotes_silence41poe.pdfIn PDF document text
    • http://dwatches.site/40650958013z7q97.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/zibenoroduzuw/xadijixonaz.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_9882824518034c74a615a8c0f0f56672.pdf?index=trueIn PDF document text
    • http://galinuv.rf.gd/how_to_pair_a_samsung_smart_remote.pdfIn PDF document text
    • http://lavowatovodab.rf.gd/what_does_it_mean_when_you_shadow_someone_at_a_job.pdfIn PDF document text
    • http://nisewizowefad.epizy.com/how_long_does_a_mini_split_heat_pump_last.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/tonotorejavokefijos.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/guided_tours_of_italy_spain_and_france.pdfIn PDF document text
    • https://4db61c00-1078-4917-8a1c-a2c1480eb6e0.filesusr.com/ugd/c94206_17273dd3d8c44b2999d93f71e36ee9bb.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_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 5692 bytes
SHA-256: 803591861573490fd9f16cd2a89a7cdb6b5c9faf2682f84bfd58babbdd3becff
font_01_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 10996 bytes
SHA-256: ecf9e2389a5d3fed87fefa7c69df47cc57f96fabf06f07f4b1fd4232f21dd794

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