Malicious PDF — malware analysis report

Static analysis result for SHA-256 0254d3b6281ad459…

MALICIOUS

PDF

68.6 KB Created: 2020-11-14 07:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4a4055d83e09f571fc59db74c1b42c77 SHA-1: 1b30fbf9d457df50d6d835287a3a2b22eaae5120 SHA-256: 0254d3b6281ad459fb852c66b966e19dc12869d9034742634ca00f9672ea6cca
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/aws?utm_term=excel+get+list+of+worksheets+in+workbook In PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/276b90.pdfIn PDF document text
    • https://samoxaposem.weebly.com/uploads/1/3/4/3/134361226/wukalalareba.pdfIn PDF document text
    • https://wegotutitupal.weebly.com/uploads/1/3/1/4/131453182/65967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_5f87ae425c799.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/7789894.pdfIn PDF document text
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/51bec13b3d57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5f904cc7b3c6b.pdfIn PDF document text
    • https://palifeselaliku.weebly.com/uploads/1/3/4/4/134441248/ninufuf.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/4130a012120f.pdfIn PDF document text
    • http://www.opentle.orgIn 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/667cca22-6af3-4b2f-900a-618c5eacd763/14409020430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637f00ac-ebe9-48b2-8961-2dc8d133129d/51311588673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa80c751-049c-42e7-bdc1-094e2141048f/long_lance_torpedo_golden_gate_bridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed04e7d0-f60d-45d0-a955-98babc5d19b1/metodos_de_evaluacion_sensorial.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000c0c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC0C8 12888 bytes
SHA-256: 638634ba1db29d8c3cd628e621abc204724c1bc4d3443097c770686f1a8fab98
font_00_sfnt_off0000aed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED0 5252 bytes
SHA-256: ecbaa6ed15d641d710dfc9955c2081213961f6cb59079edb58e647e13dceafcc
font_02_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 9636 bytes
SHA-256: a2c9866fc02da343f8982a209d2bb1f789a49fe9c6c0ce80a99147adf08a1146

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