Malicious PDF — malware analysis report

Static analysis result for SHA-256 c803cc1836bedd31…

MALICIOUS

PDF

80.9 KB Created: 2021-04-01 22:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2ab0707aaff4eb1892c6f71016ea6a85 SHA-1: 8320f2ff07a36c7ae4be63e11f0da870a60ef575 SHA-256: c803cc1836bedd31de6e754ef149bc2f0548738266437ca127eecd8540325eb4
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 0.9997

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 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://seumenha.ru/wix?keyword=clash+of+clans+lightning+spell+destroy+air+defense PDF link annotation
    • https://cdn.sqhk.co/sopiloroda/nidgigc/star_wars_jedi_fallen_order_gameplay_part_4.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/are_ge_washers_good.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/8651538313.pdfIn PDF document text
    • http://gizigevom.mygamesonline.org/50140073454.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/9uh48O4/lock_screen_wallpapers_iphone_11.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/54959937419.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/10471316998.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/AWZSTid/cat_jumper_starter.pdfIn PDF document text
    • http://datiwufirul.medianewsonline.com/comparing_fractions_worksheet_grade_6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosigegu.onlinewebshop.net/tylenol_500mg_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/vodafone_india_sustainability_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/firex_smoke_detector_two_beeps.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/pulse_secure_host_checker.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/16418441597.pdfIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_f71360bbf4f949aebaef47906a79d782.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovilowab/dinitukimiwunujalaman.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/murray_riding_lawn_mower_deck_parts.pdfIn PDF document text
    • http://zedebegeku.myartsonline.com/jewinevevirokokamow.pdfIn PDF document text
    • https://1160a196-6e18-49bd-931c-438029629b47.filesusr.com/ugd/40338c_b638672167b24da592e5a23e7661600c.pdf?index=trueIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_ff7af29f6a2343e69b5fe37d5a54f08a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tumuzu/hallelujah_piano_sheet_letters.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_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 5424 bytes
SHA-256: 49bc965f5f6ec17e1d8d1c6c771ee8313826b64bc76699f7e0564f00dc6aa42f
font_01_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 10940 bytes
SHA-256: 329c53eea3f9b00ae4d44a11c9788134fd069fdb5fd72ef306dc34bedfc1785e

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