Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a4515d79f791c1…

MALICIOUS

PDF

70.0 KB Created: 2021-03-16 03:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5a595c27bb933024004f0b77293fbc16 SHA-1: 01885c5524c971252c4507afdb65a2dd3560dbd7 SHA-256: 75a4515d79f791c1c82cd1685697b1b3d2eb79d111f1805829bb1346d0d63f65
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or host malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://golowaki.ru/wix?keyword=google+docs+icon+png PDF link annotation
    • https://cdn.sqhk.co/talexadu/OhiiMjf/wuxifapajugara.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/eyidBjj/6726874927.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/6BgeigF/tizekaramuxoxegarom.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/gjbiiji/marketplace_mall_food_court_entrance.pdfIn PDF document text
    • http://remontlegko.info/tavesulavezureganudaja0nlpc.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/fijCwji/switzerland_ice_hockey_live_scores.pdfIn PDF document text
    • http://redirunna.xyz/bawilaliwifafovuxafan0mldt.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/jcfjbEl/zedenumojesibaligonu.pdfIn PDF document text
    • http://musc-media.xyz/ramipafifasugimck1ha.pdfIn PDF document text
    • http://eliyalte.com/mirtazapine_for_dogs_with_cancer8buey.pdfIn PDF document text
    • https://cdn.sqhk.co/darojopul/ehfyF4n/nolomijilafo.pdfIn PDF document text
    • https://cdn.sqhk.co/ledirevobep/ighjdTF/bareninevonexu.pdfIn PDF document text
    • http://pokupka.space/american_government_in_black_and_white_2nd_edition_free5m1qm.pdfIn PDF document text
    • https://cdn.sqhk.co/genonitag/d2Ogegd/part_time_grass_cutting_jobs_near_me.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/b9293255-f7c1-4d51-bfce-ae86bc211bf3/how_do_i_check_my_ebt_balance_online_washington_state.pdfIn PDF document text
    • http://jedamonemazuj.epizy.com/kojazutifa.pdfIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_5383ff0ac40d4c0a9baa0a9e9f573f98.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26742db9-fa61-4d31-9f98-58787f932093/31177009500.pdfIn PDF document text
    • http://wefasinufatotag.epizy.com/77562955188.pdfIn PDF document text
    • http://jokipuzovorije.epizy.com/d_d_4e_character_sheet_editable.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_e6c7ce1a6d2d4af3a987650a161b6f4b.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_e642ab0c311d45ddb369e0cced3e2af6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93d7118-144e-42f9-8bc7-b3670e5eae77/28452298481.pdfIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_3aa4f48342a844c891093468cd49e05a.pdf?index=trueIn PDF document text
    • http://togewogovimome.epizy.com/jujotufukagikevowijat.pdfIn PDF document text
    • http://wonimawepesola.epizy.com/how_do_you_unclog_a_mr_coffee_espresso_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e83b5c9-b38b-46a0-95d5-2f92609fd789/23315243064.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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 4968 bytes
SHA-256: 8c3a556f7e718f589267e6df6a7e2ebb460cba6bbdb48ca842985226af8c4c8a
font_01_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 10376 bytes
SHA-256: cfefddd106e63b81b5a1aa7112c8d82729c7a31ba153409e6c684c863edd4003

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