Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ccf9e5f20ac5645…

MALICIOUS

PDF

79.5 KB Created: 2021-06-08 10:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0f21b382e151dc649bc70e473784f1ac SHA-1: df484bc219df544c20eada0b86023803592f3187 SHA-256: 0ccf9e5f20ac564586f95a26ae361d51f2ab1615724daf4d416cfc752575d158
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 0.9967

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=monthly+budget+planner+excel+in+rupees PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4459318/normal_60b581fdced49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_6056656557ac3.pdfIn PDF document text
    • https://xogudefimo.weebly.com/uploads/1/3/0/7/130775634/zidadesonirozujit.pdfIn PDF document text
    • https://zisawotagaxikad.weebly.com/uploads/1/3/4/4/134478332/6f3e58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_60bae6233d22c.pdfIn PDF document text
    • https://katutufoderosut.weebly.com/uploads/1/3/1/4/131437544/4069333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410222/normal_5ff7690ad6ef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_606350233e231.pdfIn PDF document text
    • https://fejiwapofiji.weebly.com/uploads/1/3/4/6/134699364/kuvemavinav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_603b64fede47e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_5fe21a9e82595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489988/normal_5ff90bb73f76e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_6054e82412957.pdfIn PDF document text
    • https://jawibonudinozof.weebly.com/uploads/1/3/4/5/134584949/9b11d.pdfIn PDF document text
    • https://rufewukel.weebly.com/uploads/1/3/4/5/134599372/riwavefadatokad.pdfIn PDF document text
    • https://sijupazijeter.weebly.com/uploads/1/3/4/6/134639914/rarerufibogejuveduno.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/3336651.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/81dd681d6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144664017/jolaxexadavuxep.pdfIn PDF document text
    • http://sawanixum.pbworks.com/w/file/fetch/144780294/78083117621.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/jatoxitonegokeb.pdfIn PDF document text
    • http://nusometa.pbworks.com/w/file/fetch/144704514/bemosuvezag.pdfIn PDF document text
    • http://fotowefufet.pbworks.com/w/file/fetch/144641760/how_to_play_catan_seafarers.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/w/file/fetch/144501585/bill_of_rights_scenario_cards_worksheet_answers.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/9751909992.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/boxers_and_saints.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_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 5652 bytes
SHA-256: f36f84572956fe04b41850ad349cf93257d82fe88b3ddb0a24423f0b12a49229
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 11312 bytes
SHA-256: c8b4728299fb18fe7cb940182ee723da637e5fd67ef08c8994a6e73736d6672b