Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8971d279c838480…

MALICIOUS

PDF

77.1 KB Created: 2021-04-17 11:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e4658e88a08e014ca675035ede6ba8ec SHA-1: 3f3e0eab9118e8b983273ab958a8421ddb0ee075 SHA-256: c8971d279c838480430fde588f5b7e2e9beeb778a08f2008fcbb019b56e890cd
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, including a link farm heuristic, suggesting it is designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, appears to be a lure related to 'solving right triangles worksheet answer key'. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

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
  • 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://xezojetit.ru/strik?utm_term=solving+right+triangles+worksheet+answer+key+math+aids PDF link annotation
    • https://cdn.sqhk.co/wuvexudid/icRafAk/lyrical_lemonade_jordans_resell.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/ifUhcF9/nefaweget.pdfIn PDF document text
    • https://sulewana.weebly.com/uploads/1/3/4/6/134605909/kulobanufimibof.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/KaigeWB/detafogipukux.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/jjHIaij/didactica_y_tecnologia_educativa.pdfIn PDF document text
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/c6ce634a61c5c9.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/muwemivumazulax/15152439024.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/vizuwigolenibe.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/flysky_gt3b_distance.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/battery_care_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72fe8a14-ac59-4e17-87e7-9bbe5c4c76fc/jersey_mikes_club_sub_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a6e7ff-6f35-4a98-8972-6ffaf79a3547/how_to_use_a_dj_mixer.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/63736713044.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/what_are_structural_engineering_drawings.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/company_confirmation_letter_for_employee_format.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/40748739325.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/dexuvaduxut.pdfIn PDF document text
    • http://zumaxupuvu.epizy.com/gesirebisadupeju.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/55173319208.pdfIn PDF document text
    • http://pobediwawe.epizy.com/idaho_fish_and_game_salvage_report.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_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 5660 bytes
SHA-256: dc464eaee91319cc5759b45714903caf5b64cbe0149ffb3f42c152dfeb6eb97c
font_01_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 11048 bytes
SHA-256: e9aaa341685b9c33e21dc0ccba645f94321dcbd85b46443b0e2a44d4d800f532

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