Malicious PDF — malware analysis report

Static analysis result for SHA-256 42baa7ca77306f2b…

MALICIOUS

PDF

74.0 KB Created: 2021-03-14 10:28:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bd49318ef05dec2e042ef5947aa04859 SHA-1: 93d9f2aead295ac2994959904afc24ea2adef1d7 SHA-256: 42baa7ca77306f2bf66a59139c8448c2c9889024b8fef70bb96e70429c780346
156 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 0.9995

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 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.
  • 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://jacksth.ru/strik?utm_term=how+to+hand+crochet+a+blanket+easy PDF link annotation
    • https://rixotojar.weebly.com/uploads/1/3/0/9/130969533/4549069.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/wedding_march_piano_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/fgfidie/trains_on_time_sydney.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/d8giyhc/1000_oldies_spain.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/nail_places_open_late_near_me.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/how_to_extend_fios_wifi_signal.pdfIn PDF document text
    • http://polypak.site/french_reflexive_verbs_listvqjwh.pdfIn PDF document text
    • http://yognat.space/high_carbon_steel_grades3pc5o.pdfIn PDF document text
    • http://aov.one/709902655383610x.pdfIn PDF document text
    • http://astrology-personal.online/character_traits_worksheet_for_grade_3sza16.pdfIn PDF document text
    • http://iranianvc.com/how_many_miles_can_a_2006_scion_tc_lasto0wyy.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/3kPjfhg/rocket_launcher_roblox_gear.pdfIn PDF document text
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/b7f052f631203.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/legipalofi/kenojaj.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/ditesovuzexemolexoneroris.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/conflict_management_style_self_assessment.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/bmw_135i_coupe_manual_for_sale.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/latest_society_bye_laws.pdfIn PDF document text
    • http://bopiguxa.atwebpages.com/63040247513.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/18460554037.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/54200839794.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/human_warlock_wow_classic_leveling_guide.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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 5384 bytes
SHA-256: 4507b3e9e19acf4d36f3eb87ee54ada58a59955bdb37c752b2655f15448c2f62
font_01_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 10236 bytes
SHA-256: ee33880f313430e6ddfebb1871c101344eaec700f274b0c0c07dafacbe7c3d25

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