Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b8183b98a3ee30…

MALICIOUS

PDF

82.1 KB Created: 2020-11-18 00:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1ee04317f834bd0d28edab14179b5b85 SHA-1: 4c5f2bb42ce45568b060c2590e038a6ffb7c652e SHA-256: 77b8183b98a3ee30aa475987f823e9eb72fe8e588f42beaf39f059455f9fdf3a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a "PDF_SEO_LINK_FARM" suggesting a malicious intent to generate traffic or distribute further payloads. One of the primary external links, 'https://trafffe.ru/123?utm_term=similar+triangles+ppt+presentation', is flagged as suspicious and likely leads to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'similar triangles ppt presentation', which is likely a pretext to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?utm_term=similar+triangles+ppt+presentation PDF link annotation
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/sitinon-vefotaselag-lewan.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/bcb576e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_5f984920a0cc2.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fodose/kezig.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/grand_atlas_property_management_indictment.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/acura_rsx_manual_transmission_fluid_change.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/seismic_design_of_concrete_structures.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/metric_conversion_chart_for_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/30721476749.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/boogie_woogie_piano_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/najadanif.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/nys_algebra_2_regents_date.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_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 2576 bytes
SHA-256: af1e3d54f15b32abbb4daaaba9b27fec80458e6c4566690596c9b5d1509d272d
font_01_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 5240 bytes
SHA-256: ac5afaa009c07f78010a867e2721007320771c365a8116635996dddda6f68ce2
font_02_sfnt_off00010180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 10708 bytes
SHA-256: ac6d6b04f445e1b04bd8164a5458da3baab7f53cfcfbe1ff71430487e4052d46
font_03_sfnt_off00012618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12618 16108 bytes
SHA-256: 4aa7347f7d6fae0e4f111037f2d175cbb8ebb6991ea5033a4c965ceea32bd775

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