Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f820f3f650d830…

MALICIOUS

PDF

81.5 KB Created: 2020-11-25 17:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 71cee7f127e3431ef29c7092ec4296b3 SHA-1: 1d8e125c878d8c3f9385fbaac6e329887adeb8f3 SHA-256: 00f820f3f650d830d59d6098f2bc39a5b5499be4e2ea1e67106463f713c677e4
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of the primary URLs, trafffe.ru, is suspicious and likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. No scripts were extracted, but the document structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://trafffe.ru/strik?utm_term=vaikunta+ekadasi+2015+date PDF link annotation
    • https://lenafalem.weebly.com/uploads/1/3/4/4/134491844/35d03b4a411e0af.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/ebb6fa87afd6f50.pdfIn PDF document text
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/9758288.pdfIn PDF document text
    • https://xefepalig.weebly.com/uploads/1/3/4/6/134679085/1380449.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c4a6cfd2-4803-4247-abe5-fd5ec36feea3/72754010259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9273d444-362b-4d81-b98f-bdaded469e3f/stephen_king_rita_hayworth_and_shaws.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/minimalist_hiking_boots_black.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/auckland_international_airport_map.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/fnaf_games_unblocked_66.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/bivariate_frequency_distribution_and_correlation_class_12.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 4944 bytes
SHA-256: 4e29101b004415e1f780e75d6e915f757010504f45eb77ba9689b047b6e40ee8
font_01_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 8876 bytes
SHA-256: d4d00ce4b07930548f3c816fee3e0c7e6762f0327ce352d00c89dba5dc55597d
font_02_sfnt_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 12336 bytes
SHA-256: 36f96c404d1276c779ab9c96b289da887ab89a3352482b2d7ff8d8d0a7efd7f8
font_03_sfnt_off00012b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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