Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cb88b54cc3589b…

MALICIOUS

PDF

77.9 KB Created: 2021-05-23 18:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c1a136924dea253620f4860c35b4aafd SHA-1: 5be09c7597c0dcdac9649887efb70792d7866993 SHA-256: 86cb88b54cc3589bcfa9d80bcb7753be1e1ed66c38f440f234c123972d70aa9b
246 Risk Score

Malware Insights

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

This PDF file is identified as a credential phishing lure, specifically impersonating Coinbase. It contains a mass of external links, many of which point to disposable hosting services and redirectors, designed to lead the user to a fake login page. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary goal being to steal user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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://jigibomafife.weebly.com/uploads/1/3/0/7/130738667/pixagewusolosi_nikenegigo_feropimevalameb_gifonax.pdf.
  • 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://xezojetit.ru/strik?utm_term=how+to+get+script+on+roblox PDF link annotation
    • https://jigibomafife.weebly.com/uploads/1/3/0/7/130738667/pixagewusolosi_nikenegigo_feropimevalameb_gifonax.pdfIn PDF document text
    • https://melazikadoxu.weebly.com/uploads/1/3/4/5/134594637/kusowapifibiminew.pdfIn PDF document text
    • https://sulekigotama.weebly.com/uploads/1/3/4/3/134307446/76ef8fb7d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503525/normal_5fe5005899bf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489586/normal_6013bb1a0cda0.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/536eb62be7080f.pdfIn PDF document text
    • https://gomosonu.weebly.com/uploads/1/3/2/7/132712120/6107128.pdfIn PDF document text
    • https://pezilesuwubev.weebly.com/uploads/1/3/4/6/134639222/1600727.pdfIn PDF document text
    • https://fezekisovo.weebly.com/uploads/1/3/4/6/134661064/9485565.pdfIn PDF document text
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/zuzidenarow-gowifo.pdfIn PDF document text
    • https://zaxadumumuguxe.weebly.com/uploads/1/3/1/4/131454216/sisavufoxoxeti.pdfIn PDF document text
    • https://kudarori.weebly.com/uploads/1/3/5/9/135960502/8e8f6abd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390383/normal_606723c037266.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/giwer.pdfIn PDF document text
    • https://rorenaziva.weebly.com/uploads/1/3/1/8/131871817/c146776.pdfIn PDF document text
    • https://nukegakisuwagaj.weebly.com/uploads/1/3/0/7/130739250/wazulojur_ligukudoxubog_juwarekolusuvaw_wirarizawu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/14b4bd36-ac16-40cc-a01c-55d660257677/garmin_gpsmap_64x_handheld_gps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3cef7c8-703e-4240-adf4-74512cab2407/bixejeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d61dc7-6cde-4698-9960-7d2a794721f0/6.0_powerstroke_turbo_rebuilt.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_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 4940 bytes
SHA-256: 6eb235909dedd19d98d0ab00e94660b1bbe348f1b1c6d124b88c00db0bcccad8
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 10976 bytes
SHA-256: 4f8ace8c91672bd034d4e83e107f5cf265a14d0becd0e03e8cbc2ce45b03dce0
font_02_sfnt_off00011be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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