Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83bf2f0e96ac8c2…

MALICIOUS

PDF

73.5 KB Created: 2021-02-27 01:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 02ef06b4cd91409abd29721eda8b5226 SHA-1: 04c6e5f8f0106d91d79cc21f830d256e6e2fb0ad SHA-256: c83bf2f0e96ac8c2b3a4033284055510be992981e1b64dbb8234b957421c60a8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many pointing to benign-looking PDF files, suggesting a link farm or SEO spam operation. One of the embedded URIs, 'https://baarspo.ru/aws?utm_term=girl+by+jamaica+kincaid+litcharts', is likely part of the lure to drive traffic to malicious or spam content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/aws?utm_term=girl+by+jamaica+kincaid+litcharts PDF link annotation
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/vuvegose-nebipo-rogijatemasurig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368237/normal_5fed755344bb6.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/sakoxoxasavavo_dufagofitej_wezav_merosewilow.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/hjOgcjb/building_services_group_little_chute.pdfIn PDF document text
    • http://ketorebagibof.22web.org/75104769998.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/hbjefjd/91586700611.pdfIn PDF document text
    • https://mudagetani.weebly.com/uploads/1/3/4/3/134381332/daa33f1aec30f.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/defujo/75102938626.pdfIn PDF document text
    • http://kidogip.epizy.com/iowa_dot_511_road_report.pdfIn PDF document text
    • http://mipivazub.epizy.com/xorafukuwem.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/70006646362.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/94419184790.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/ubuntu_vmware_for_windows_7_free.pdfIn PDF document text
    • http://dogefifuga.rf.gd/44875339912.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_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 5592 bytes
SHA-256: 65b7ba6b5b7dfede0c5320746112606d180f45ad40dfb816498f01811aeaa1db
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 10452 bytes
SHA-256: cfe862e010c252b493fbb59e0e4ca843db14c87299d79756fe30e601d8b91c82

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