Malicious PDF — malware analysis report

Static analysis result for SHA-256 5252c7d1048d6b86…

MALICIOUS

PDF

69.5 KB Created: 2021-02-20 05:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 230750d14da741c9c183c66d77b37a53 SHA-1: a566bf13bff980b53dba5c933103b92f1d03714b SHA-256: 5252c7d1048d6b86a2dca66aba612ea5fe79d4d2e2908561b7ec75a067635ce3
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and a link farm hosted on disposable infrastructure, 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 printer troubleshooting, likely to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+do+i+print+photos+on+my+hp+envy+4500 In PDF document text
    • http://busurman.space/army_promotion_board_bio_templatekfrr5.pdfIn PDF document text
    • http://joblanc.xyz/degusevajixoxeriniseza5n6b.pdfIn PDF document text
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/gidaleled-damadafezamabob.pdfIn PDF document text
    • http://mebel-albero.ru/jaduvawiwikibufufagih0tr.pdfIn PDF document text
    • http://fullstacket.online/carpentier_s_reconstructive_valve_surgery_downloadfkfh4.pdfIn PDF document text
    • https://vukexelisijaka.weebly.com/uploads/1/3/1/0/131070195/8882751.pdfIn PDF document text
    • http://repochka.site/magoxibon0amho.pdfIn PDF document text
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/misopovufen_pawazosem.pdfIn PDF document text
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/1270872.pdfIn PDF document text
    • http://telgrm.site/a_little_history_of_philosophy_chapter_15_summaryr00kh.pdfIn PDF document text
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/3bbe6e36f62d0b.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/djdtfif/home_weather_station_reviews_national_geographic.pdfIn PDF document text
    • http://leoidet.xyz/rosajowinopupufeledab4keam.pdfIn PDF document text
    • https://cdn.sqhk.co/vixokezafafu/bihjbif/equalizer_apo_not_working_with_discord.pdfIn PDF document text
    • https://cdn.sqhk.co/baradudapati/wifB8k8/wonopeliketebarumirevo.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/gjje4gV/singstar_microphones_ps2_not_working.pdfIn PDF document text
    • http://oneplusonemain.xyz/71379301664glaja.pdfIn PDF document text
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/0b7761e1aa5.pdfIn PDF document text
    • https://pizotiwedif.weebly.com/uploads/1/3/4/8/134868845/wogasefemexasu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magajavopisili.epizy.com/dukare.pdfIn PDF document text
    • http://xoxinazur.rf.gd/cost_of_building_a_loader.pdfIn PDF document text
    • http://zavufomagug.rf.gd/debizijurinowakubeminad.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_off0000d03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03C 5528 bytes
SHA-256: 885a50ca51a9bbe086df73ee4c8111c8e732824519df2020ed5202f06d6c86f3
font_01_sfnt_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 11012 bytes
SHA-256: f1a75c7bb3968342a8ff2b9b9ff98dce1fb721e5610eff8ee6ae6699a09f7019

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