Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b98deda4043a701…

MALICIOUS

PDF

84.1 KB Created: 2021-03-08 22:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 78378b5f97e4e399d25cba7527656b0d SHA-1: 39c5fd714703ee4eeaca18a6e48a91032a193625 SHA-256: 1b98deda4043a7018b1b18dd6f410b56ab4588422c234e9ed640eb7b273f03a7
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file detected as a phishing trojan by ClamAV and ML classifiers. It contains a lure related to SAT math practice tests, which redirects to a suspicious URL. This indicates a phishing attempt designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xajibur.ru/strik?utm_term=new+sat+math+practice+test+online+free PDF link annotation
    • https://cdn.sqhk.co/pufuxarabo/fr22hh5/dungeon_master_ai_2_download.pdfIn PDF document text
    • http://fresh-ita.fun/is_procreate_on_ipad_pro_freeovrsx.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/icQZhib/can_you_build_a_bridge_animal_crossing.pdfIn PDF document text
    • http://netewe9.xyz/53190081275ls98j.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/ghM2phh/fuxuz.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/piradi/tilokarulaboxasez.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/15305644917.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/tovikivotufagesegavuno.pdfIn PDF document text
    • http://suwutosu.epizy.com/clat_2014_question_paper_with_answers.pdfIn PDF document text
    • http://gabitotedusaled.epizy.com/verizon_fios_router_g3100_specs.pdfIn PDF document text
    • http://wewefaxekedafoz.epizy.com/simple_present_tense_unscramble_sentences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d52985-2aa7-49b0-992d-ca5008ebf95d/how_do_i_know_if_my_cpu_is_compatible_with_my_motherboard.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/kekexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc0d62da-9819-4ece-8118-d955daa27d81/gatixovarukos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09da2082-314e-4fb1-a475-69c5b7b6bafb/toyota_camry_220_sei_for_sale_in_sa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06902cbf-a70b-4fdb-92d5-2823f2c3e502/43921071077.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_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 5316 bytes
SHA-256: 89ba3040ef22e8050749a630345f2231a0a3d89cb9b0d3364f56a332f91188ce
font_01_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 10588 bytes
SHA-256: 9acba711d1bf4c916d9a79d5017063cfd2d9ca16099f14cff356ebc79d741d8a