Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ddf78b3d66f9ed…

MALICIOUS

PDF

73.6 KB Created: 2020-11-12 19:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 22a2a3287824995d6e0162427880642c SHA-1: 45d94c3b56b880aff6ae3461c0e7d38c54fba739 SHA-256: 77ddf78b3d66f9eda27c0cf2acc99a4534a7aa2ac5b809ccc6dd9c56e60e135e
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The embedded URLs and the PDF's structure indicate an attempt to redirect users to potentially malicious content, likely for advertising fraud or to host phishing pages. No scripts were extracted, but the PDF's nature points towards a malicious intent to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://trafficel.ru/123?utm_term=oaks+north+golf+course+reviews PDF link annotation
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/5343156.pdfIn PDF document text
    • https://daletapobuwero.weebly.com/uploads/1/3/4/6/134666872/1798133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5fa294eac9d6f.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/tugibob.pdfIn PDF document text
    • https://nurekagenarufab.weebly.com/uploads/1/3/1/6/131636906/7f5f9ec1d01f.pdfIn PDF document text
    • https://votixired.weebly.com/uploads/1/3/4/6/134633812/567291066ed.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/jelikij.pdfIn PDF document text
    • https://seforurusux.weebly.com/uploads/1/3/4/1/134131879/45255138.pdfIn PDF document text
    • https://faxufoxexukixel.weebly.com/uploads/1/3/4/4/134455740/6481484.pdfIn PDF document text
    • https://xogupugisi.weebly.com/uploads/1/3/4/1/134109029/fabewat_lufubewimugozod_bamabekix.pdfIn PDF document text
    • https://sewiwojura.weebly.com/uploads/1/3/4/3/134371681/e0731eb80ff6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/15701700-b45b-4b88-a3d1-e040b1b5b0fa/15469646661.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/plexus_henry_miller.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/the_great_gatsby_ch_6_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758f3ea7-9b7c-4cdb-a392-15a4ef0b9219/43067411652.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/dobogiwu.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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 5384 bytes
SHA-256: f4db64f3b347e9ff7c94483ce69492be367e5abb1b6578167a7d1a8c83275056
font_01_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 11516 bytes
SHA-256: 6c7e8c1cdb34c4fdae9344cd40ea24a5fe4cf498987a7f6905f6ce2dfe47afb7

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