Malicious PDF — malware analysis report

Static analysis result for SHA-256 3453d8d0d54b41c5…

MALICIOUS

PDF

75.2 KB Created: 2021-01-01 10:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 54e53bc57f60ec80aec96d9d15d10e18 SHA-1: b30f8845afbdcedb76de4a667593506724978225 SHA-256: 3453d8d0d54b41c5355f93958e13c1ee35b4ed79380fd19fd2c92223b5147387
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm for SEO manipulation or to host malicious content. The presence of a critical heuristic firing for PDF_SEO_LINK_FARM and ClamAV detection of Pdf.Phishing.Trojan indicates a malicious intent. The document body, though partially corrupted, contains text related to a 'letter of introduction teacher to students', which is likely a lure to disguise the malicious nature of the links.

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://trafficel.ru/123?utm_term=letter+of+introduction+teacher+to+students PDF link annotation
    • https://cdn.sqhk.co/relulapezele/hcZWjjK/free_criminal_case_search_california.pdfIn PDF document text
    • https://zivodigogugev.weebly.com/uploads/1/3/4/6/134664532/mijajivuwik.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/iihhiev/depujus.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/5jjBDHw/xupopaluwodufi.pdfIn PDF document text
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/987537.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/hgcsBjg/73234622839.pdfIn PDF document text
    • https://jisogixisizula.weebly.com/uploads/1/3/4/3/134328009/8246781.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/jgD4jfe/1900816516.pdfIn PDF document text
    • https://sijupazijeter.weebly.com/uploads/1/3/4/6/134639914/vaxaji.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/ghEu3Nr/40871920164.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/iaejdhh/manezubutafi.pdfIn PDF document text
    • https://pesakezered.weebly.com/uploads/1/3/4/7/134729162/793759.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/vukujidor/kilitefemozusedali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da71cd56-a980-4ff5-84ba-0a6f2801d208/16315972615.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/important_facts_about_rosa_parks_childhood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7605920d-d34c-4c8f-9922-fb79e52ce169/free_coins_for_pixel_gun_3d_no_survey.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_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 5016 bytes
SHA-256: 32fd4f89f84474c440be01dc34c84fc3a026e50c9b92f94a2572cc34e055a754
font_01_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 10424 bytes
SHA-256: 83c319f79235de5df64ec9c797c4734012687e4022790743b7bd01bd37bbf835

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