Malicious PDF — malware analysis report

Static analysis result for SHA-256 220891721226adde…

MALICIOUS

PDF

84.9 KB Created: 2021-04-15 22:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1e331d331b0936487546fe45852b573 SHA-1: 2507335cafa2ac06ba02213a40cdd209d8dccde3 SHA-256: 220891721226adde59770ff01b1585127f9cd6f6bf07be212a14eed2f7251991
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting it functions as a link farm or a phishing lure. The primary malicious URL identified is https://nipisod.ru/strik?utm_term=read+warrior+cats+manga+online+free, which is likely used to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=read+warrior+cats+manga+online+free
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/dijijuzular-vumanobiraw.pdf
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/9a855fe.pdf
    • https://kebumemimax.weebly.com/uploads/1/3/1/6/131636814/e0f1aa32.pdf
    • https://poteluteko.weebly.com/uploads/1/3/1/1/131164474/6ac3be25.pdf
    • http://ita-bio.fun/becket_sheet_bend_knotxqze5.pdf
    • http://gratoramaa.website/304593389434g9nm.pdf
    • https://static.s123-cdn-static.com/uploads/4489976/normal_5fe23912dfc92.pdf
    • http://freshmind.net/histology_and_cell_biology_an_introduction_to_pathology_kierszenbaumisk42.pdf
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5ff1aee0b7984.pdf
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/nawilorofuzutopofe.pdf
    • http://eyebrowthreadingdallastx.com/national_electrical_code1maeh.pdf
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/6485159.pdf
    • http://cabinetsop.xyz/jolipubesapaguwurobani5win4.pdf
    • https://mafetowijij.weebly.com/uploads/1/3/4/0/134040640/97ac71a90dc1c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_fb9215ab404a4e459f4eae471c7336e2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/21e4ab45-b66d-4586-b3be-8f55ce4df1e2/when_we_feel_young_lyrics_when_chai_met_toast.pdf
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_c354f59fd0c24ca3bd77863c890592ee.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ba80145c-d559-4061-bbec-e7173ae88635/how_to_connect_canon_mg3022_printer_to_wireless_network.pdf
    • https://uploads.strikinglycdn.com/files/59229f45-588c-4431-bfaa-8b535c3cbf0c/how_to_change_time_on_nortel_networks_phone_t7208.pdf
    • https://uploads.strikinglycdn.com/files/c5defced-6fd2-48db-96a4-27e732d8b488/our_god_chords_key_of_c.pdf
    • https://uploads.strikinglycdn.com/files/11cfeb8f-88b0-4b48-8b63-5bd02dfc8709/renakabokaloxu.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_off00010ef3.bin
2a2e6e526098f569e3bd49be3f8319c974b4acba2d5e0ae1b2bed5cffefda1af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 5440 bytes
font_01_sfnt_off00012176.bin
7f81e533b985cfa06f67a99475f6a374efeb1731f6b73536fca8946ee84302c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12176 10740 bytes

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