Malicious PDF — malware analysis report

Static analysis result for SHA-256 acce9bab8a2c6a42…

MALICIOUS

PDF

68.9 KB Created: 2020-12-17 00:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b863f44de80f17f5acbc6366eaac703e SHA-1: 1cb1eaac1296de8932043fd9766d70587b5ee739 SHA-256: acce9bab8a2c6a42124ad87237489d7f62de4d717199fbd7c51346b7505ab576
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan. The embedded URLs likely serve as part of a phishing campaign or a distribution mechanism for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/aws?utm_term=2012+cadillac+srx+service+manual+pdf PDF link annotation
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1392291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447101/normal_5fac2d0b8b3c0.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/2daec3eb3c.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://static1.squarespace.com/static/5fc1b51b40f1034a5cae9388/t/5fc2cc383c02f22b9d694e06/1606601785726/vupenevulogiwag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2cc1736-2ee8-4880-a4c4-5a534136fb82/psychology_unit__study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/bond_fund_performance_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ec6f7c-3fd4-499e-ad24-48c1bc7cbb16/el_eternauta_parte_2.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/work_power_and_energy_worksheet_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/77432151815.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/baby_cradle_plant.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC315 5352 bytes
SHA-256: e23d7cfc7e68e6f50fb8c72f2096213bef2de198d920472c9185134c762ca6e7
font_01_sfnt_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 10460 bytes
SHA-256: 41343bdf1f99c7da4a7217709d470988e62796393c9d24d477bef4e5b888588a
font_02_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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