Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7aaf2b7f80eda8…

MALICIOUS

PDF

76.4 KB Created: 2021-04-01 11:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 44f0dc2a8b445f0bcc42943f00ff8fd9 SHA-1: 440bda740d1ef5b244a41f0c7ecdb7e92dfdf9cb SHA-256: 3f7aaf2b7f80eda8b07592d638146672975fc73e7a2715970e712c4f22dfb711
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to external PDFs hosted on various domains, suggesting a link farm or SEO poisoning attempt. One of the URLs, https://dafemum.ru/wix?keyword=graduation+project+ideas+for+mechanical+engineering, is flagged as a known malicious redirector. While no scripts were extracted, the structure and URL analysis strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=graduation+project+ideas+for+mechanical+engineering In PDF document text
    • https://cdn.sqhk.co/fafujedajir/igrgihb/13675961127.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/vobuxetom.pdfIn PDF document text
    • https://tetejinuditobig.weebly.com/uploads/1/3/5/9/135973847/9532754.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/sutipeli.pdfIn PDF document text
    • https://dejokorakas.weebly.com/uploads/1/3/1/3/131379117/takeb.pdfIn PDF document text
    • https://wovodolu.weebly.com/uploads/1/3/4/8/134861979/woloxosenosix.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/EgeFhbV/linking_verbs_list_23.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/mokixetat/berkshire_hathaway_annual_stock_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6c6494-af5b-4d43-9a8f-fa816cf1c779/54025550798.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/optiplex_760_audio_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a59ceaf-ab27-49c5-9e06-894f8395f138/kagifofoxolosulazudizepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f28c386-515c-4803-abe3-ba78208c4d0c/5389969184.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/xagonavogeruresanubuvazi.pdfIn PDF document text
    • http://kisomelug.rf.gd/24711919721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54577e7-1043-4970-a29e-64a8396c1d50/rusemokiwunazaravuvisoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bafe54c-93bb-48d6-90ed-7158642336fc/dogexogatugarovobe.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/zetepemefiruximinujekabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4a80a9-9ebd-49de-b5c0-aeebddd49ad7/hayward_w3aqr15_aquarite_electronic_salt_chlorination_system_for_in-ground_pools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7132ed-085e-412e-908e-3bec2204c12d/rukuraf.pdfIn PDF document text
    • http://lomuripejo.epizy.com/avenza_maps_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb00bd9-6b31-46f3-882f-fd311b631080/phonics_assessment_for_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/54967192191.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_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 5676 bytes
SHA-256: 367f5f015a6a57b96802dd7b6e2f43026b77defac7f3f1ed5a97a174f90e7565
font_01_sfnt_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 10284 bytes
SHA-256: f3d8efdf6c888bd0b8e499291d44e58e54e766e66114f52bc03becc9ba836097

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