Malicious PDF — malware analysis report

Static analysis result for SHA-256 705a93fdd5d869fd…

MALICIOUS

PDF

72.3 KB Created: 2021-04-07 08:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2bcd83928c16dc0d1a7209ae6e76c4a SHA-1: 580d8d44abf332bd66dd49f8e8e3f5b0a9d9381a SHA-256: 705a93fdd5d869fd9f1398f8096bc659debbfff447ab9f1f9963162a4d57cac6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to suspicious domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly indicate that the document is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=jacoco+coverage+report+maven
    • https://static.s123-cdn-static.com/uploads/4490251/normal_5fde8ff9f3d3c.pdf
    • http://zipubezexupoka.mywebcommunity.org/73089660050.pdf
    • http://digitalmicroteter.xyz/sap_inbound_delivery_serial_number_tablevrdd3.pdf
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5fe81cb9cff80.pdf
    • https://widufosonetorif.weebly.com/uploads/1/3/4/5/134598319/wemifumop.pdf
    • https://zoparimunafixi.weebly.com/uploads/1/3/4/3/134336740/103338026391d.pdf
    • https://static.s123-cdn-static.com/uploads/4416513/normal_5ff55f1bb707d.pdf
    • http://fakts.design/nihongo_tango_speed_master_basic1npic.pdf
    • https://namunoxup.weebly.com/uploads/1/3/5/3/135339392/fujugidifa-poxetino.pdf
    • https://zaberiwa.weebly.com/uploads/1/3/4/4/134444812/8702287.pdf
    • http://nigoguno.scienceontheweb.net/31380240769.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tevigotu/nasexewumezusov.pdf
    • https://s3.amazonaws.com/xaliwalufoguni/balanis_antenna_theory_book.pdf
    • https://s3.amazonaws.com/pobixedele/lubutazisosiwasu.pdf
    • https://s3.amazonaws.com/sorogamat/90447849297.pdf
    • https://s3.amazonaws.com/mukutud/75515631945.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd35.bin
e9fc3fd42a759a0bab2bb8b5788e9c3cc29f3a5b3b7b1870da8d788778e33437
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 5092 bytes
font_01_sfnt_off0000ee82.bin
c54f70ee05b0f4891774d795a7b03fd377e0cfb54d6e3fa5d0577e659b0bca29
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 10956 bytes