Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ea471c1b2eb872…

MALICIOUS

PDF

61.8 KB Created: 2020-11-24 08:23:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1b2e81c47b1502aeaa404c9c8da51065 SHA-1: 90400b062cbaf60838298ef46dc1abf644d90f79 SHA-256: c4ea471c1b2eb872daa3f437f5aeec52cfbd4fd33648b2eee4546c9e1b8a46cd
156 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 0.9995

Heuristics 5

  • 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.
  • 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://trafffi.ru/aws?utm_term=scarlet+ibis+anticipation+guide PDF link annotation
    • https://kejifesabateg.weebly.com/uploads/1/3/4/8/134847793/6a9a33e72b98.pdfIn PDF document text
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/5959408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413347/normal_5f952e39eaba7.pdfIn PDF document text
    • https://xuvowesajitox.weebly.com/uploads/1/3/4/6/134603534/16cd05e7b.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/susonanezaj/ccmp_full_form_cyber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3966121-6a4f-46da-8b74-1ac266423d8f/xijinumif.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/how_to_edit_video_on_apple_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/which_sentence_is_not_written_in_academic_voice_apex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b44b0f2e-5aba-4803-a0f1-12b3da8d37ec/mono_red_tron.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/38491784341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f917cc-6992-45cb-9c56-0ec98c8b8436/vazedonesefuzodiwepabivig.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/last_stand_union_city_hacked_unblocked_dylan.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_off0000b482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB482 5484 bytes
SHA-256: 6944956b8295db695e956c9551a98a9313a3f8cfda83ecb9fde4a62ce7743a81
font_01_sfnt_off0000c72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 10368 bytes
SHA-256: 0441581fe263d5242dba04859bcfee02e293656fb3f6180255266bfea4aae7ca