Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb0243708213ff3…

MALICIOUS

PDF

73.6 KB Created: 2021-03-01 11:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 16a0ee3c9c0ff7982fcff599deeff9ff SHA-1: 659195a9d699fadfaf2382ed649386cba595e3a7 SHA-256: 3eb0243708213ff3a57eff5c65fd9e4e7e59753e1ef62c4c8b82ffe8f67ebde4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic firing suggest the primary goal is to drive traffic to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://maypoin.ru/award?keyword=subordinating+conjunctions+song+itsy+bitsy+spider PDF link annotation
    • http://wowurilagufa.iblogger.org/38383447483.pdfIn PDF document text
    • http://bunnygummy.ru/kizevitisekudurujjchw.pdfIn PDF document text
    • http://originalhallyu.com/hot_rod_garage_episodesv7cdh.pdfIn PDF document text
    • http://health-top.ru/what_is_the_smallest_roku_tvsr71a.pdfIn PDF document text
    • http://skout.tech/dovezun9xyq.pdfIn PDF document text
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/5211257.pdfIn PDF document text
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/6063623.pdfIn PDF document text
    • https://vojubewerele.weebly.com/uploads/1/3/4/0/134013512/55cc421eb4.pdfIn PDF document text
    • http://carbackseat.site/molalonasaposugowuvixajusc8in.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/pirofopafu/difference_between_behaviour_and_attitude.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/ketujajugajal.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/binaural_beats_for_astral_projection_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/vodepamanu.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/asus_rt-n66u_admin_password_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/72591658096.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 5632 bytes
SHA-256: 8eb2b6b18db274e2c2df6609b3355d5017bc44951b6791ef947a9bfbf1a57bb6
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 10044 bytes
SHA-256: 8ee368f9bbe03a1203e04ab0ded96b5ff0550c3e0583e73e90a0f3cdc30106d5