Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f368a816667acee…

MALICIOUS

PDF

79.4 KB Created: 2021-04-13 22:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fb0b6799cacdf7c4433218095272b069 SHA-1: 78fb19e26deae74791a01faa215bedcea8c73797 SHA-256: 6f368a816667aceeec87b9f3cf61de4899682b8a81871582f892ce6a10eefb02
286 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The presence of a 'Password-protected archive handoff' heuristic and a 'Brand-impersonation credential phishing lure' suggests the document's primary purpose is to trick users into downloading password-protected archives or visiting phishing sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/kugegilogid-dobavamikewo-jepebofel.pdf.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/strik?utm_term=asus+rt-n66r+default+username+and+password PDF link annotation
    • https://cdn.sqhk.co/fujotojaxob/yLchaha/answer_to_4_pics_1_word_level_3561.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/kugegilogid-dobavamikewo-jepebofel.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/g0ghic7/download_ball_shooter_mod_apk_unlimited_diamond.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/bc072b6c.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwebuvowo/Cgdijii/shiva_nuts-_bolts_hardware_hubli_karnataka.pdfIn PDF document text
    • https://gofabede.weebly.com/uploads/1/3/1/4/131453232/dogizomivewiza_vikadetiwes_merojavif_vonamazisa.pdfIn PDF document text
    • https://cdn.sqhk.co/lebapivi/NNwjhae/dead_paradise_2_hacked_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/wihbzJc/80144141767.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/obat_anti_jamur.pdfIn PDF document text
    • https://cdn.sqhk.co/davusegeb/GXid3l9/53633055826.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikunakudu/ijgfLhd/raguzuxesizipeva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zibelasavu.atwebpages.com/dyson_absolute_dc17_animal_price.pdfIn PDF document text
    • http://rodobokojezaga.epizy.com/37833693840.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_2820413ee67a482a9a8ee0a895e5dbdf.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_6c3a658edb78473eb5fbff158bffd640.pdf?index=trueIn PDF document text
    • http://pebomotixot.myartsonline.com/how_to_reset_element_tv_remote.pdfIn PDF document text
    • http://vedaremix.epizy.com/vixiteronirawiduxepo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 5452 bytes
SHA-256: 5f6ed7c246e3308e693531b635b5978742a172a534b7f0f8ef071111a1c010ac
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 3120 bytes
SHA-256: 6aa82955e117d44a43ee3f00d38721e5a856e0beaa5e9be21e4b15ad85f5f80c
font_02_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 11604 bytes
SHA-256: 60c954da5db00f20a41bb0c7891d2e4008a223e54f6cd424fb34631cde3ed326

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