Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fc115bd5273a30…

MALICIOUS

PDF

77.2 KB Created: 2021-03-14 23:00:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c396e486405c39310121c32fdaa85656 SHA-1: b1c79d865e0cb30362c4bf65781701456170ced3 SHA-256: 80fc115bd5273a30a8dcce52669c1f3040c72146def7d7bf5c6335adbd386fdc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable domains and acting as link farms, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to URLs that are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=el+libro+de+los+sue%25C3%25B1os+quiniela
    • http://hyipinvest.site/basic_music_notationcpjpc.pdf
    • https://taxinureku.weebly.com/uploads/1/3/0/8/130814469/wavixukajobemaguru.pdf
    • http://rentline.pro/sipiwapetarufuraxz3rpv.pdf
    • http://mupifojoxur.medianewsonline.com/explain_exception_handling_in_java.pdf
    • http://supobesopo.mygamesonline.org/36679874869.pdf
    • http://sefesipodaj.22web.org/let_it_be_piano_sheet_music_original.pdf
    • https://perelixaji.weebly.com/uploads/1/3/4/8/134881923/muvowijuvekati.pdf
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/kepezenaxakazukug.pdf
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/7b913d17d3cf7.pdf
    • http://zanovekolasin.mywebcommunity.org/what_is_unanimous_consent_and_how_does_it_work_in_the_senate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_df8c9bfef6df4adfa53a212e2ebb9cd6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e0316807-12b9-4a16-9319-d4e872791a30/how_do_you_toast_a_hot_dog_bun.pdf
    • http://pezomovororiz.rf.gd/37652884385.pdf
    • http://nenunosulijud.rf.gd/scaly_anteater_pangolin_information.pdf
    • http://bogurivesinoni.rf.gd/free_victorian_modern_cursive_handwriting_practice_sheets.pdf
    • https://uploads.strikinglycdn.com/files/4d57e852-a158-403f-8d44-2e6217fe8506/recycle_canon_ink_cartridges_tesco.pdf
    • http://xikufozumif.epizy.com/24377273695.pdf
    • https://uploads.strikinglycdn.com/files/f78754da-27aa-4bb5-9fbc-429f50eea0d1/dymo_letratag_clear_cartridge.pdf
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_158797827aa84fa8af4b20475a42e209.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdb.bin
d369acfadc0f31b313917a6c510be5133c54c4fc64fddb944ad07c467a7efda8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 5256 bytes
font_01_sfnt_off00010178.bin
43cf5a9ebfcf343a10aca03c55033f9614cd010a8f55c2d18ca73385ab10ce6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 11212 bytes

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