Malicious PDF — malware analysis report

Static analysis result for SHA-256 961cdb1ca83f99c0…

MALICIOUS

PDF

74.9 KB Created: 2021-06-09 04:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff225edc96c00806b0f3d5a8d05d4601 SHA-1: 7124587f43da41bb40012a2fe7241094567921bf SHA-256: 961cdb1ca83f99c00d92017999aa8f85870d9d498466f32df516033c46a9a22d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are numerically or generically named, suggesting an attempt to create an SEO link farm. One of the primary URLs, 'https://infrive.ru/pbw?utm_term=download+supersu+root+apk', indicates a lure to download an Android application. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/pbw?utm_term=download+supersu+root+apk
    • https://fojakejozu.weebly.com/uploads/1/3/2/7/132712415/mirepigupelobebesovo.pdf
    • https://bovoladimuva.weebly.com/uploads/1/3/0/9/130970023/b2ce5df9234be.pdf
    • https://static.s123-cdn-static.com/uploads/4501975/normal_5fe15dd8cadde.pdf
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5fd0ecc00eaf5.pdf
    • https://zisifogadudup.weebly.com/uploads/1/3/4/7/134765868/mogixewikipig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4a3c3243-b5b9-4ee3-947f-7aafc1e2aeca/28379223183.pdf
    • https://uploads.strikinglycdn.com/files/e8c4ce74-3c28-4305-a31a-ab8d3048dc46/71514014187.pdf
    • https://uploads.strikinglycdn.com/files/e9b76909-b32f-4f5c-9fd6-c9e82c3b45c8/solomons_organic_chemistry.pdf
    • https://uploads.strikinglycdn.com/files/33578cfb-2be5-42e7-8ab3-cbc655df1dac/partition_dernier_des_mohicans_cornemuse.pdf
    • https://uploads.strikinglycdn.com/files/1494772b-998a-4209-aee3-95da4b4fce06/88787806948.pdf
    • http://vulazojab.pbworks.com/f/38269528210.pdf
    • https://uploads.strikinglycdn.com/files/ca7e9833-5e8c-4915-89fb-d24998277c6f/goteboxixafutidusuwu.pdf
    • https://uploads.strikinglycdn.com/files/a15caee3-08c5-4def-a961-bab518be624b/dabelelamobemuwidavamo.pdf
    • https://uploads.strikinglycdn.com/files/5cf00733-db49-4140-a23b-4b6aa4cf21d5/shark_fabric_steamer_gs300.pdf
    • https://uploads.strikinglycdn.com/files/6f263399-39bd-424f-9753-0426848cb3b9/3956142902.pdf
    • https://uploads.strikinglycdn.com/files/780312ef-e183-484f-b2a4-e0cb8038a6f9/14571840758.pdf
    • http://pejuzor.pbworks.com/f/36287713925.pdf
    • https://uploads.strikinglycdn.com/files/129f6ef9-f0a0-4662-80d5-6ccbcdf8c4e0/47657449073.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df57.bin
04c9e905f1261ff58c130692d277df8cf4e0e76eedc39f86d262e40ea78db444		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 5108 bytes
font_01_sfnt_off0000f0e1.bin
a4e58139aa24f5887830650cfa54118dec56da1ae933f0d0c84accd5675e96ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 14740 bytes

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