Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a8ba909c16c352…

MALICIOUS

PDF

71.3 KB Created: 2021-03-21 23:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 12e2044afd1fafe8cbaaa7da80a5116a SHA-1: 3a9bb888c7f1257a954b66f9e80a95c78f3d9f30 SHA-256: c8a8ba909c16c352293d8743a48ee34c2b74cd69c1823783ec97657a450c7f16
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to 'Awards and honors 2020 pdf', likely a lure to encourage users to click on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=awards+and+honors+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/tememagitapo/jQnji7C/fupesuzomegezab.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/Vjcjiie/xuxopopex.pdfIn PDF document text
    • https://cdn.sqhk.co/joxopejufito/ibjcktN/13799516611.pdfIn PDF document text
    • http://guitar.su/employee_training_and_development_strategyl5ket.pdfIn PDF document text
    • https://cdn.sqhk.co/kesavaki/igYljf8/pixel_car_racer_best_tune_for_supra.pdfIn PDF document text
    • https://cdn.sqhk.co/vumulevezuf/H4tjbhb/bumewozuvinexitunetobo.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/oxMiaig/14960799832.pdfIn PDF document text
    • https://cdn.sqhk.co/logulemuset/hfZFvhf/fejebolejumalatitodetibax.pdfIn PDF document text
    • https://cdn.sqhk.co/taguvomir/j4byKha/college_panda_grammar.pdfIn PDF document text
    • http://6gusevshop.website/659843667253zoo8.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/vgdgjEU/gesupikabagujogeveviku.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/ORmgcXX/tukigilegidikumaxanudi.pdfIn PDF document text
    • https://cdn.sqhk.co/vutabopi/2mLicSS/55378321004.pdfIn PDF document text
    • https://cdn.sqhk.co/duwefetufe/jgg0Lib/66497138014.pdfIn PDF document text
    • http://reduslim-ordina.site/tivaloxinebibm43wi.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/ebPxhhq/64977677062.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_9509b6a7e3e04720900007fd74e89d03.pdf?index=trueIn PDF document text
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_da42eb818c89429c850322e42ce25539.pdf?index=trueIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_293af301a9e6467e9c1fa6d4e5192183.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_737174fec99e4e5d856de53cb6a62bfa.pdf?index=trueIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_8a31ea9e79d14090bf3ce5ac210092b5.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_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 5452 bytes
SHA-256: db6a8d7c77dc06a3c13d77d048d56578f930e3c1e5f6f7d2ff36f662012b3fd2
font_01_sfnt_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 10864 bytes
SHA-256: cf61a473acba29f7bff858e97a7dbf37c5f88b4cdbe01e10d707acd51ba5260c

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