Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fee1818e080a9e9…

MALICIOUS

PDF

78.6 KB Created: 2021-02-27 10:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7d6fcda6f473490ba443d87b2ff24ba5 SHA-1: 10650ea54c368883e906045c4634fc5b0a95af3c SHA-256: 7fee1818e080a9e99713709d0dc3d010c2f4cebdb5458f46b1b10586b2f59e6d
244 Risk Score

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, including critical alerts for linking to known malicious redirectors and hosting a large link farm. The embedded URLs, such as dafemum.ru, are likely used to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to manipulate search engine results or lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=introduction+to+abnormal+child+and+adolescent+psychology+3rd+edition+pdf In PDF document text
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/91a8aa9d.pdfIn PDF document text
    • https://wezisewego.weebly.com/uploads/1/3/5/3/135342704/256e9.pdfIn PDF document text
    • http://1fps.ru/503833940900d8si.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/nogenigorakotademobe.pdfIn PDF document text
    • https://vavulawukuret.weebly.com/uploads/1/3/4/6/134690424/1878c61dbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_60388b7214d10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_60248c68c7185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469852/normal_60009e1c89678.pdfIn PDF document text
    • http://realnoe-obshenie.online/pink_flamingo_film_streaming_vfytrpo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_6035376782cca.pdfIn PDF document text
    • https://kenojulovananav.weebly.com/uploads/1/3/4/0/134016885/xopomumajuwag.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/wotodedaruzuk/how_to_set_temperature_on_lg_french_door_refrigerator.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/10963132499.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 5912 bytes
SHA-256: 061fcf7ce65e9c41a7cb4100d1b960f2609c3468fdcac9c6faaf29e57cde8279
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 10716 bytes
SHA-256: 2d9a43b7036422a0fc08a28d0dd07161ce73a99286ec195a8e06cccd4252cf10
font_02_sfnt_off000117d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 16084 bytes
SHA-256: 462d13bd97d7d9b38b38dac4ddb889f891d4742debcdf3bbf084b15d68e01d41

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