Malicious PDF — malware analysis report

Static analysis result for SHA-256 accf2e21c63168e9…

MALICIOUS

PDF

73.7 KB Created: 2021-03-15 16:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cc37d872c33b5ea8c381cce080120095 SHA-1: d262fd37ca4345ba6b6dd275dc9a8cb466dbb263 SHA-256: accf2e21c63168e9ba88a5c62961dec9ab5b1c20c0b18eb39d633117426a4325
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to educational materials, likely intended to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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://baarspo.ru/wix?keyword=lesson+1+terminating+and+repeating+decimals+answers+page+269 PDF link annotation
    • https://cdn.sqhk.co/vuwonesi/W6uZjh7/dowofujigipifobowisoroge.pdfIn PDF document text
    • https://cdn.sqhk.co/litopozuf/geLjj9e/best_music_player_2020_apk_download.pdfIn PDF document text
    • http://vbruti.site/adjectives_and_prepositions_exercises9enjp.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/BDheTjj/pokemon_cards_walmart_price.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/gjRETge/download_minecraft_launcher_bedrock_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/eDgghwi/mopotasufiwumiki.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/eb218.pdfIn PDF document text
    • https://cdn.sqhk.co/lizubenesowi/dhghyie/gevajanatowotegamufaba.pdfIn PDF document text
    • https://redefanugolikiz.weebly.com/uploads/1/3/5/9/135975275/jazazivu.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/podupukoxidapo.pdfIn PDF document text
    • http://acgmgroup.ru/castle_crashers_pets_guidevaigk.pdfIn PDF document text
    • https://cdn.sqhk.co/jamolipa/gexgcjd/super_discount_pharmacy_plant_city.pdfIn PDF document text
    • https://cdn.sqhk.co/bepesewutu/GBhb3hi/vukagasedusumavokak.pdfIn PDF document text
    • http://bt-management.website/accident_report_in_denver_co1ncso.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/nrhgibO/18799026748.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/caging_skies_christine_leunens.pdfIn PDF document text
    • https://movekepuvixoma.weebly.com/uploads/1/3/4/0/134041071/lokusoxuxenewew.pdfIn PDF document text
    • http://igafnd.org/blue_iris_app_wont_connect3k3ad.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/aspects_of_political_development.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/bc965a4bd8ca.pdfIn PDF document text
    • https://cdn.sqhk.co/sagitusat/YBDzx2Z/97655671115.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad060920-74d0-4a59-a46a-f478898ed72a.filesusr.com/ugd/a7c1e6_2b9e6a66670145f3800c2743f8790da7.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_de2d0e24560e42bdaa56a5edd4cc6c66.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_514877090906459a99bb63d10774a196.pdf?index=trueIn PDF document text
    • http://dapekafuxururo.myartsonline.com/does_coconut_milk_contain_carrageenan.pdfIn PDF document text
    • https://a26b494c-4f54-4b9d-aaa3-e02d462d315a.filesusr.com/ugd/c6268f_1e5aa49e14a946a2a97260c1b804fb0c.pdf?index=trueIn 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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 5920 bytes
SHA-256: c3811a32a88180364e2e2d361aa49a6616d41d6b81b5b48416fd131de626549d
font_01_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 10492 bytes
SHA-256: ec5ab763dcd95d530cfedb7b1a14890ad6059fbf463c8ea812b34728b185ecbc

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