Malicious PDF — malware analysis report

Static analysis result for SHA-256 0111d7493890e512…

MALICIOUS

PDF

75.1 KB Created: 2021-03-10 11:19:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d0c6517d7883e869b097f09ac3288ac9 SHA-1: df413ec5d69292977a279aee5a2d4823a4e4d937 SHA-256: 0111d7493890e5121f93d2b902460f624fe6e7d36c0032832bdd68d0a9096c73
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational materials, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=greenhouse+effect+worksheet+middle+school+pdf PDF link annotation
    • https://soremezu.weebly.com/uploads/1/3/1/0/131070226/wepupow-fesifij-zikupe-jopilose.pdfIn PDF document text
    • https://sosufafa.weebly.com/uploads/1/3/4/8/134862430/1355521.pdfIn PDF document text
    • http://kindraretterath.com/how_much_money_do_natives_receiverrxrz.pdfIn PDF document text
    • http://instapriz.online/2693575694920sut.pdfIn PDF document text
    • http://smallita.space/modern_calligraphy_alphabet_capital_letters3fq58.pdfIn PDF document text
    • http://sarawavenudiwap.mygamesonline.org/kamitazivagibojotijajuv.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/ukulele_easy_songs_hindi.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/fried_green_tomatoes_book_summary.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/dusotumam.pdfIn PDF document text
    • http://zupurowuzuxule.iblogger.org/plasmid_isolation_by_alkaline_lysis_method.pdfIn PDF document text
    • https://fuwewarudizikip.weebly.com/uploads/1/3/4/6/134644733/rikozewopumagu.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/duwajoselogepu1anpd.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/473244.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/sasefenapis.pdfIn PDF document text
    • http://businesslinecenter.com/beyblade_games_for_androidscx3p.pdfIn PDF document text
    • http://rukaranu.22web.org/english_grammar_test_b1_b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/00706cc0-d7cc-460d-bf98-7950bcd05843/60590006934.pdfIn PDF document text
    • http://nupifikitove.epizy.com/zenagepujunewapapan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5de847ee-7250-42d8-a2d1-9373bb988cc6/how_to_use_intex_saltwater_pool_pump_filter.pdfIn PDF document text
    • http://gefuwaw.atwebpages.com/xixukuvoxubuzomi.pdfIn PDF document text
    • http://zuxakenupe.epizy.com/57013781571.pdfIn PDF document text
    • http://musubokem.rf.gd/zadaviwiriroribesuwel.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/87078746735.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_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 5372 bytes
SHA-256: 13ff0300c81f02cd8b4b16b536adc954d0d8bdcd863a885b5961edcd46e2bde4
font_01_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 10732 bytes
SHA-256: 852b57be586ba0994f8544a94478da4c2999f1533702ccf2d50c8d035bcca0f3

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