Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b8ac151ab8dbc1…

MALICIOUS

PDF

78.1 KB Created: 2021-03-15 17:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9cac12f019e39a6926ce69ad18f47b32 SHA-1: 5178f73e946870c2ed0b2378d731087e8dfd3230 SHA-256: 33b8ac151ab8dbc198458f21099ba029b8a296fa2363eb26946e899c1477b371
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 0.9997

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://soxebez.ru/123?utm_term=pathways+4+answer+key+pdf PDF link annotation
    • https://togawikanow.weebly.com/uploads/1/3/5/3/135320583/74854837f80d5.pdfIn PDF document text
    • http://risonubokedoxav.scienceontheweb.net/5022917666.pdfIn PDF document text
    • https://geliwesirodired.weebly.com/uploads/1/3/1/3/131382982/6093980.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/kanada_vefenijeba_nezujovilej.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/a1dea28f91f3a.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/88117517661.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/7886912416.pdfIn PDF document text
    • https://jurijibo.weebly.com/uploads/1/3/0/8/130874645/xomug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_ca568a9e06714d1daa6af6af8583fbec.pdf?index=trueIn PDF document text
    • https://5da1c7d8-01c4-4175-bbf8-c25915566394.filesusr.com/ugd/1084fb_44b3646c9d164df28d4690bdcd069ebe.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_191586c4be624df48baab1b8e6ef6d18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/turip/3303450209.pdfIn PDF document text
    • http://bepenopivite.epizy.com/wimovazokotajawusasotebu.pdfIn PDF document text
    • http://zosejanukapub.rf.gd/31218121749.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_76f7ff24f617452595151470aa63c79e.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_19944b9525fd42eb9a52472337d55d88.pdf?index=trueIn PDF document text
    • http://dowijasimenazo.epizy.com/xakemilisewod.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/xetomatoviwidi.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_f62ac62dbe454c41b8d5e86d1c071801.pdf?index=trueIn PDF document text
    • http://suzimisefodude.epizy.com/apcoa_connect_app.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_fcf17b5c06a54fc4ad63256db56c9291.pdf?index=trueIn 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_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 5444 bytes
SHA-256: d43161ce5b65545f3c2b250dda9c0971e81c7a4a70145289d84432af5bd40cb5
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 11196 bytes
SHA-256: 017f13a5b2cf847e466941d1b0ad9ac6cadae6fb0869e0968df86d5812ce79a3