Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a5947d8a6d6af1…

MALICIOUS

PDF

81.5 KB Created: 2021-06-07 04:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a2515e033623629deb695073d56edb85 SHA-1: ab650146b4783be29e99ca591ca3d61a733a9f18 SHA-256: a9a5947d8a6d6af18ce7dcb59aef78081af35ce3bbfb1b9e8169eccba9caedc2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nomylo.ru/pbw?utm_term=resident+evil+5+full+movie+in+hindi+free+download+mp4 PDF link annotation
    • https://zemaxixose.weebly.com/uploads/1/3/4/6/134636511/xivinek-tebunonebawero.pdfIn PDF document text
    • https://mafakovik.weebly.com/uploads/1/3/5/3/135347242/f2b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_60439665efd86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410433/normal_5fdb396ed63ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_602a5b672342e.pdfIn PDF document text
    • https://tixamipoku.weebly.com/uploads/1/3/4/7/134740597/b006571daf2a91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jawegele.pbworks.com/f/2013_polaris_sportsman_500_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/555980f0-4875-404e-b169-0b10e7abf9ff/37634895981.pdfIn PDF document text
    • http://nudifimixonu.pbworks.com/w/file/fetch/144750645/universe_sandbox_2_free_alternative.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdfc794f-b9b5-435d-a7c4-d5f114e2b820/zoraniza.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/gcf_and_lcm_test.pdfIn PDF document text
    • http://botinuba.pbworks.com/f/lokokupegodidoligeri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/289e1416-657b-4278-bbfa-ff3da75fb1ef/hamilton_beach_flexbrew_49974_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e99665e-67db-435e-aed6-8d49777a5752/nobexirane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c83b78d0-cc99-472b-a491-25c7a9576a54/canon_ip90_printer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de7b46a-ffde-4601-a116-85be41ff81ed/briggs_and_stratton_vanguard_engine_number_location.pdfIn PDF document text
    • http://vosebim.pbworks.com/f/wusitukuxamasefireva.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/shigleys_mechanical_engineering_design_10th_edition_solutions_chapter_13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a98ba5ac-b143-4ea7-ab34-f9a067141751/nafev.pdfIn PDF document text
    • http://xibosini.pbworks.com/f/wegozukigegub.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 5652 bytes
SHA-256: c67e3a968e61760c9260140f40976b54dbc93568abfa3963a6689ff77fc2047e
font_01_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 11280 bytes
SHA-256: d629e4114dd4bcdfbaaf2d3e7836faa7bb034b20e5455d40bf78509660e21c1d
font_02_sfnt_off00012344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12344 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550