Malicious PDF — malware analysis report

Static analysis result for SHA-256 6581ecc9b77d43d7…

MALICIOUS

PDF

74.6 KB Created: 2021-05-23 21:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0a1a2992616464ba680e9ef9f5708604 SHA-1: d6268cdc63f5062cf34611c90f9f0580d8ea98ef SHA-256: 6581ecc9b77d43d77b83a7fb17d0b203714b95f8ad3302587c407878b168e5e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=lesson+outline+lesson+3+acid+and+base+solutions+answers PDF link annotation
    • https://fopalese.weebly.com/uploads/1/3/5/3/135349797/jakizudotowiti.pdfIn PDF document text
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/5098518.pdfIn PDF document text
    • https://karubidodofibe.weebly.com/uploads/1/3/4/3/134316277/ca3adf2027f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_606c798a69485.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446026/normal_5feb1174f40f4.pdfIn PDF document text
    • https://tajuweselu.weebly.com/uploads/1/3/4/3/134362517/kezabuxorute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_60188adad029a.pdfIn PDF document text
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/pogajowo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5fdd5c6f5387a.pdfIn PDF document text
    • https://mivifasev.weebly.com/uploads/1/3/1/4/131483453/fojesis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_60152a66cee9a.pdfIn PDF document text
    • https://manapefowuv.weebly.com/uploads/1/3/4/6/134605974/6c21f851f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/6460946696.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/bersa_thunder_380_parts_list.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/final_fantasy_6_remake.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/foxodogapanonuju.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/is_there_a_reset_button_on_a_gas_water_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/what_is_the_social_learning_theory_in_child_development.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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 5268 bytes
SHA-256: bdf897263e65f78cb84556305a52240b3921dae57c28eb6db8007459ae10979e
font_01_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 10312 bytes
SHA-256: 02e93f0e5e0d9ea4fc7ba4a481c5bbe661689bc51e14c0338a92d5b67330b154