Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37a05fab1747880…

MALICIOUS

PDF

73.4 KB Created: 2020-11-24 00:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7762d731058a3e0d85b985114827bd48 SHA-1: 114697d7356b5044901436fbb07d35e012c78be0 SHA-256: a37a05fab1747880876cc620670c3ba70c2fa9687e4a1f181544e5ced6c7803d
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://trafffe.ru/123?utm_term=california+standards+test+science+grade+8+answers PDF link annotation
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/0324cf738960be0.pdfIn PDF document text
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/votenogajamimilit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421335/normal_5f987ecfeef2e.pdfIn PDF document text
    • https://kawikesidalebel.weebly.com/uploads/1/3/4/6/134649090/komusezukuduje-kafizaw-pimopetivojir-gulotubon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f978b8a62cf4.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/jolituzoji/words_that_start_with_inter_prefix.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/noxasekiginetofijux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50929d98-c08e-4e72-b254-00da7acebb99/rexavobamuz.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/fufotaxulob.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/bipolar_self_assessment_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e5b2ae-7cda-4a0a-a2dc-1bbd55f50f27/vinayaka_missions_university_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/annabelle_demon_true_form.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/8194035518.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_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 5380 bytes
SHA-256: 8e1ccf3fa7803a0116c12bbfbc06784374aac0b46b00eb888b58f34cdffc25ef
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 10224 bytes
SHA-256: 22a88f23fd7fac112d66046286cee1a46eefbfb4c131eb1cf7791dd475de0e17

Open this report in the interactive analyzer, or submit your own file for analysis.