Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a81f4bfd5788ecf…

MALICIOUS

PDF

62.7 KB Created: 2020-11-11 21:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ba863675fd7720e7ffdf6cddf0541c6f SHA-1: dff42f79aea49f71735e283082d6e505272c9acc SHA-256: 1a81f4bfd5788ecfcdf649ab128b90cd3f4da31d12cf4c39423bae685e6ae6fa
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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://traffking.ru/strik?utm_term=three+body+problem+liu+cixin+downloa PDF link annotation
    • https://xororowikaluna.weebly.com/uploads/1/3/4/6/134643421/vuziwomipido-bosumajawi-tufalesogapub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_5fa09c76d20bb.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/21736d4514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f96534a12713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f8a6ad71d466.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/67863696-1c7c-46f5-98a5-f15817e4dcbe/north_america_worksheet_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c4b05a-47ed-44cf-8c2e-787fba62d0fa/26689626557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f6ce1c4-290d-4433-8532-625fde8cfb97/sometimes_it_takes_a_mountain_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078dda1a-2071-4184-99aa-4bfd21d814a8/amazon_senzu_knife_sharpener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf73695d-852d-4b9b-abd5-cd2394e91e59/56842109801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1109ec7e-cf1f-4095-8a8a-6088d7b456c0/41621448173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c308ba-d104-4bd9-a392-9acd39baf509/lk_indir_yandex.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_off0000b869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB869 5488 bytes
SHA-256: 1317072fb9a9a4323bb0c8cd8b9cb002a960882ee527b8a537430e163543a318
font_01_sfnt_off0000cb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB00 10468 bytes
SHA-256: fc7dda8b8e1d00087275c429537a1fdb544a10fa34d4421da02b9b817da442e7

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