Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a016d17312ee67…

MALICIOUS

PDF

73.1 KB Created: 2020-11-19 09:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bbc9569994597000024351215f636c4d SHA-1: 274b5ef1e3c7d81df202760d5d0537b1737ce448 SHA-256: a8a016d17312ee679aeafadef2a7f03e20533d9fde2cad7c43da897f5451442a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffi.ru/123?utm_term=reliance+606+water+heater+specs PDF link annotation
    • https://piwoviwilo.weebly.com/uploads/1/3/4/3/134386066/b1793b0b7ca.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/vabovezu-dodamiw-gutagapaz.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lulodegoner.pdfIn PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/lazivof.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/5369362.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/viwuzub-vixotu-wodiwalabe-garazozabifol.pdfIn PDF document text
    • https://xisegebimir.weebly.com/uploads/1/3/4/3/134340076/3967058.pdfIn PDF document text
    • https://jiwadurator.weebly.com/uploads/1/3/0/7/130776405/tajara.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/13403653275.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/dinaxoposix.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/rewigaruki.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/i_ate_the_divorce_papers_monologue_2_minutes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45eae5eb-eae2-4dfd-902b-5ed483ae650c/82941545945.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_off0000d513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD513 2968 bytes
SHA-256: cd9387d714275c170fbb7341e624de8499dd0865699aee1023a3ba912ceb7a28
font_01_sfnt_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 5416 bytes
SHA-256: abb8d9a920f0ee0099c44e21ab987142f647426d1dc087d427aa860a7b4d5211
font_02_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 10796 bytes
SHA-256: 2152063416ad2b73875bc3619d8661bd697a8987c3673e4c5e1ee8d4923f4a72

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