Malicious PDF — malware analysis report

Static analysis result for SHA-256 8793d6eb2d4f1fbb…

MALICIOUS

PDF

74.2 KB Created: 2020-12-21 20:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2ca465ecf4dc682125e8045cfe581d24 SHA-1: 93039f0cd98e70cae86cb0db970be4d4969da944 SHA-256: 8793d6eb2d4f1fbb731c6fc9429b240fda5036dbad62df14e07fc52f2370d09e
164 Risk Score
Tags
free-cdn-ebook-manual-lure

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 phishing or malicious intent. It contains numerous external links, with one pointing to 'trafficel.ru', suggesting a link farm or redirection to a malicious site. The document body, though heavily obfuscated, contains text related to 'Input file accept pdf only' and 'wkhtmltopdf', hinting at a deceptive lure.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/aws?utm_term=input+file+accept+pdf+only PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5fa16e12b9aab.pdfIn PDF document text
    • https://bafalado.weebly.com/uploads/1/3/4/8/134865771/294978f3ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380528/normal_5f99cc8d3c82e.pdfIn PDF document text
    • https://jetaganugobemib.weebly.com/uploads/1/3/4/8/134895639/lulifozate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5fb8e562e4083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416321/normal_5fbfb47f66b3d.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/bejokazemur/inferences_worksheet_1.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/absage_angebot_formulieren.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2830cc30a162e0c5caa26/t/5fc5bc739b1ed03538a42734/1606794356081/world_history_powerpoints_for_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/jewoxulixilonaluj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00874a5bc066edfa0f7a0/t/5fc1135e9ee0f32b8778fbf3/1606488934177/berks_county_events_this_weekend.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/norivufed.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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 4912 bytes
SHA-256: 9581ac4c857aa05c3520f5813da120a29bf8ad01ad0bb9e09cef419fe74075e1
font_01_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 11408 bytes
SHA-256: 0e48173a6a6e0ce64b82acc5f956f8e0945116358f27095f6b313c5c4b72108c

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