Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d19897ef6ec357…

MALICIOUS

PDF

72.3 KB Created: 2021-01-20 10:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 78faa0cdac6fa182bc2b11ef2ff05ced SHA-1: 3b75f4204c1243c7ab8f8ce8163a0a76611b4a79 SHA-256: 34d19897ef6ec357b91544d3edc923ad82429a15dd21f5b440ce9e5f117b92d4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jottigo.ru/123?utm_term=quadratic+equation+standard+form+to+vertex+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418199/normal_5ffb6fc8b0b75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366022/normal_5feb7f1095644.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/zikew_zanetujunig_mofupopu_jawovalapafamaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410976/normal_5fe287991fe02.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/6547197.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/cbb1671dd7e0f97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5f97423bec82c.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/likerutuvazijev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_5f9e8635523c2.pdfIn PDF document text
    • https://mofaxogarapew.weebly.com/uploads/1/3/4/7/134771612/vurasi-rogasifozebu-filewib-fijes.pdfIn PDF document text
    • https://barigager.weebly.com/uploads/1/3/1/3/131398159/6264725.pdfIn PDF document text
    • https://gubaxuxozixiviw.weebly.com/uploads/1/3/1/3/131383744/bca754c0be3a.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/p8iguhh/cooking_fever_2019_update.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/sutawowirosuvuv/installing_reporting_services_2008_r2.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/sheridan_sheets_online.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/new_baby_images_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 5452 bytes
SHA-256: fd63909ea720e69f398d8b774182841caac6d487df52ebb4ffa6ae292948a617
font_01_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 11112 bytes
SHA-256: 93c534e66faba213dfa00f9629cbb181b45fc03c53d6aec755f241754c06585b

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