Malicious PDF — malware analysis report

Static analysis result for SHA-256 9312f33c980c51a3…

MALICIOUS

PDF

63.7 KB Created: 2020-12-31 22:48:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8f43928d5746937ae78655c8e12e762b SHA-1: ad663e198ef17a0cd3ca7d671690ea8a51f64703 SHA-256: 9312f33c980c51a32290fd5fcbd7e924c7c63aae4001f800ab98e00254f80ec4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://traffking.ru/123?utm_term=elasticsearch+in+action+pdf+github PDF link annotation
    • https://rajufunes.weebly.com/uploads/1/3/4/7/134760411/zuperatur_noxariruzubum.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/8203c84df.pdfIn PDF document text
    • https://vopesowe.weebly.com/uploads/1/3/4/6/134638419/poruvok.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/werezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_5fbb3e58db5e4.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/612d1f4.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/tirimofufemukat/gudenupejizuxad.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/wipubuteniwoxine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17175426-3a3c-4b43-83ae-c09eda6ebd47/life_of_pi_study_guide_grade_12.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/38242654533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43b5272-3f5d-4402-996a-3bd443844573/jololenurepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c628990-5e6e-4b44-98db-df339b63a60a/land_rover_defender_workshop_manual.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_off0000bc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC24 5512 bytes
SHA-256: f3039d6bfcfbf0f9672a54c770c89cb309a139de85ade582f36562ee9ac7fadc
font_01_sfnt_off0000ced7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED7 10276 bytes
SHA-256: ab9d640e594210414af2e793f715246acddbdf9faa7d2c4c615714311807c7dd