Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1642ffc267a0a9…

MALICIOUS

PDF

74.2 KB Created: 2020-11-13 06:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f308105a428808faeddeda35e990afc0 SHA-1: d92f85aac8c01f92b91026cbc89dd77d42e80e09 SHA-256: 2c1642ffc267a0a9840f555e7aa64a6d2028096d0897cd1b278594b9c1f7718f
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 0.9996

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://traffnew.ru/123?utm_term=evaluating+trig+limits+worksheet PDF link annotation
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/4de9d49667.pdfIn PDF document text
    • https://lesesaxaxutetu.weebly.com/uploads/1/3/4/6/134613106/gutemamof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5f87d63bdba26.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/kasedabuzoli-givaraloga-rewolilopel-xavimaninevobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5fae055d612fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tadovu/voretejoma.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/18774466273.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/tudabubopodovom.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/98312588385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ab1b29-eefd-4de5-b217-94be62486f2c/50_tons_de_liberdade_legendado_compl.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/vedexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e662f6c1-8e44-4209-8159-cf850b240a58/madoritowikimamebaj.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/area_perimeter_and_volume_of_shapes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1C 5152 bytes
SHA-256: 496079ff8f5ca79cb5134c5ac808dd61f37677cfd6c30f029dac919e326cb4cb
font_01_sfnt_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 11744 bytes
SHA-256: 950346d7f51c4c616ed46dcd7e69edc947983fba96da6dfe07a30d6acd433876
font_02_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 16060 bytes
SHA-256: b10e7a0583bf6b216a5471aeed10f14210f1dda3adb60ac5169fcb38ba12e60c
font_03_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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