Malicious PDF — malware analysis report

Static analysis result for SHA-256 b905141d79d4cb73…

MALICIOUS

PDF

74.0 KB Created: 2021-05-10 16:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d2821916d07556a8fa9526d3ad6f0ec6 SHA-1: e12427ba0b532efd510bba533b4508542fd3f017 SHA-256: b905141d79d4cb73305e253e017c47061d3e2e716d669ca2ad86c306334434f0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for SEO manipulation or to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest potential for exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=sql+cookbook+%2528cookbook+%2528o%2527reilly%2529%2529+pdf PDF link annotation
    • http://wafolifinibi.22web.org/rotixapusojatogevujum.pdfIn PDF document text
    • http://xumugawejal.scienceontheweb.net/glossary_of_research_methodology_terms.pdfIn PDF document text
    • http://vovavipegum.getenjoyment.net/careless_whisper_solo_guitar.pdfIn PDF document text
    • http://mevilesiroxivo.iblogger.org/33918617920.pdfIn PDF document text
    • http://metaleagle.ru/69626522204hiu1c.pdfIn PDF document text
    • http://worldthailand.fun/95369304940ry7kr.pdfIn PDF document text
    • http://zesaguzijor.mypressonline.com/pabakeramitawo.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/d7938021-54a8-4ca6-b674-3acca9eb99ec/karcher_pressure_washer_service_center_in_ernakulam.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_9509352b76794dea88cf6c418911ddb3.pdf?index=trueIn PDF document text
    • http://vomewudige.atwebpages.com/ridosafabelezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd32d267-e42d-4009-bba5-08493ade193f/why_is_my_birds_beak_turning_black.pdfIn PDF document text
    • http://tinutun.epizy.com/71833911083.pdfIn PDF document text
    • http://walefusariwe.epizy.com/gominowulagumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99932eb0-be37-4be6-b28d-209d3c0fd932/how_to_update_marantz_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92da8fb1-5094-492e-aa16-4fb7c2486f90/gsm_alarm_system_installation_guide_franais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4c520c-88e0-40f6-af0c-cd435e8c420c/me_before_you_streaming_english.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_978f5e3d5b21492990a10df8293abb48.pdf?index=trueIn PDF document text
    • http://kozogasivufi.myartsonline.com/75969284802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9d2116-78ce-4bcf-a9f7-15a53283398a/legazojewa.pdfIn PDF document text
    • http://tidokapisu.epizy.com/53353583092.pdfIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_d74ab31d4dcd45539858415f1c107705.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_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 5484 bytes
SHA-256: a18e64231a29bcc02d52b4bd11a4034741fe061f36606cda90685eaf34df2987
font_01_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 12088 bytes
SHA-256: 52ed783819f51205e2a1fcdf4e07a88bba791a449e7ba71d8674783a826c62cb