Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6497431edde856e…

MALICIOUS

PDF

85.5 KB Created: 2021-05-18 08:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e74405981d97d32ea317f4caa3d530cf SHA-1: 5ea6ea8574ebb6f8d4c70455cdb967fec292f4fb SHA-256: f6497431edde856e669128e82850f2b711216c1c1e34e42242393dbb0af28348
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 0.9994

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://seumenha.ru/strik?utm_term=how+to+analyze+likert+scale+data+in+minitab PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420028/normal_5fed4b2244b90.pdfIn PDF document text
    • https://suxokigivulumu.weebly.com/uploads/1/3/4/4/134479742/289f881e7dcda5.pdfIn PDF document text
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/432461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_604b8b2e1ad9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5feb559b8bb85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409425/normal_60513d26a6bb0.pdfIn PDF document text
    • https://nobiramiw.weebly.com/uploads/1/3/4/4/134403563/516993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_605d86bd35d1d.pdfIn PDF document text
    • https://jinafoxibufesow.weebly.com/uploads/1/3/5/2/135293268/5226343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5ffc4b1d16fca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383572/normal_5fc62d3e68c4b.pdfIn PDF document text
    • https://daxigowopijadek.weebly.com/uploads/1/3/0/8/130814785/4ba0537c.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/4aa36bc3-57bd-4ab2-a1ae-1024cbdc0141/2005_harley_sportster_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b3b9f0-2e34-4530-957e-b204326f923d/wumimavobiwupe.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/ascension_parish_school_board_policy_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/simple_recyclerview_android_example_androidhive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed2b5d0-81d4-44c2-ba88-4f51e5d4c47a/mejisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55038f4-7fef-43da-86fc-4701bc472a9e/we_were_liars_summary_part_2.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/zujokilenobodoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac438204-ad2b-4bfc-9814-a88758d912dc/majitoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdf22eab-01b7-432d-bed8-024e039389ef/tuxamumukoreba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1801e74-7b1c-4e4c-94b2-803f60fa8c20/22040985717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c08575a-8226-4926-aab2-fa5ee9473df9/regori.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 5496 bytes
SHA-256: 0d5d6cc96ffeb6ea632525fc574946305ea3ea5485ad90c2503ea49ad28f16f5
font_01_sfnt_off0001205b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 11276 bytes
SHA-256: 4485cddc809d24564f06d02abb3e53a27e83922e6e079ac72074819ad5757e09