Malicious PDF — malware analysis report

Static analysis result for SHA-256 879edda3eef11b8d…

MALICIOUS

PDF

79.3 KB Created: 2021-05-30 19:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d88bc52278beac868ea4a764e8ef4271 SHA-1: 2af9d713619b47d08441a8ff6438988809a7d01f SHA-256: 879edda3eef11b8d4efcb22cc199b7d218b9ce950ac7cf7b3ec53c3dca0a0732
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 0.9993

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://botokaw.ru/123?utm_term=brisbane+7+news+reporters PDF link annotation
    • https://batagokefo.weebly.com/uploads/1/3/1/0/131070859/5840062.pdfIn PDF document text
    • https://rosufira.weebly.com/uploads/1/3/1/4/131408230/03b5261f98ca.pdfIn PDF document text
    • https://dalagusixofu.weebly.com/uploads/1/3/4/8/134853238/1f5f2bf826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_6014784975008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_60224ad363f19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5fe0a64aaf994.pdfIn PDF document text
    • https://larebefol.weebly.com/uploads/1/3/4/6/134691273/5926102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388827/normal_6017cf55ec3c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383471/normal_6049006156b99.pdfIn PDF document text
    • https://xinogibujijinak.weebly.com/uploads/1/3/4/2/134235465/lutigaliko.pdfIn PDF document text
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/7962740.pdfIn PDF document text
    • https://zojivevu.weebly.com/uploads/1/3/6/0/136090852/megufetegerupif-wesuselo.pdfIn PDF document text
    • https://tudanane.weebly.com/uploads/1/3/4/5/134596872/gamipaxos.pdfIn PDF document text
    • https://pavuxutekukos.weebly.com/uploads/1/3/4/7/134704216/4943911.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451230/normal_5fca091a7fa39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479226/normal_5ffabd2722989.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/fedobafamomobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_5fdaae678150b.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/87560714-9cf8-44b2-9297-b9873a2c51e2/seewer_rondo_dough_sheeter_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a8314f-1efc-458d-9e9f-cbdee82a0632/how_to_start_a_news_article.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a21eedc-116b-47d9-9467-90d84865fd62/16402361999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1195c6a9-ca36-4dfa-8f0f-05e52e12fc90/22190010845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd24340-e358-47dd-aa5a-01396030ae7f/what_is_the_moral_of_the_story_the_emperor_and_the_nightingale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d1a192-b6ec-4e63-ae3a-35b5313902c1/how_to_search_google_images_with_a_picture.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_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 5140 bytes
SHA-256: 3923de2028bfcd9322219eac4926b2200d4e0c97f979029332aea33bff4da720
font_01_sfnt_off00010b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 10852 bytes
SHA-256: b6dd6bfed3a8ff1213970f2fd42278f6a370d21243741e2c0c4665b7b9ac80fc