Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d5820c59721dbb…

MALICIOUS

PDF

91.8 KB Created: 2021-04-05 20:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9f7190bfd4cdc9823ee4e5a4a09c5199 SHA-1: 64ed089fa62e68141a62d68af58fe44af1b0cfe6 SHA-256: c3d5820c59721dbbda2e673fff9a96e3a989001468082854b25e37de14215ce9
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous external URLs, with a primary focus on https://pelibifir.ru/award?keyword=bihar+stet+syllabus+pdf. This suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/award?keyword=bihar+stet+syllabus+pdf PDF link annotation
    • https://cdn.sqhk.co/sitopizol/dF7hWZ8/house_flipper_xbox_one_review.pdfIn PDF document text
    • http://lomilinixigal.mypressonline.com/denube.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/out_of_sight_out_of_time_ally_carter.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/ifhhVjh/70638732601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_5fdc62e7c3eb1.pdfIn PDF document text
    • https://cdn.sqhk.co/pukefoxer/fEdifji/speedy_cash_near_me_now.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/3ICAjbM/40963510817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484154/normal_6036c982334e8.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/95062129589.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/jhrGagn/virorewixavukez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_00f832980cef48c1aa0248542eb4680b.pdf?index=trueIn PDF document text
    • http://nopugorib.onlinewebshop.net/circularly_and_elliptically_polarized_light.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_3516fb5e089844d2ac32cc362e031c17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e61d60a-0b9e-4dc1-9815-c2bb009fb61a/husqvarna_128ld_carburetor_fuel_line_diagram.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_334c2dc45d7b415fb07e605395840ed5.pdf?index=trueIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_5328341d60ac4ed38680a27aae3710ad.pdf?index=trueIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/pukirakuwazazepukipadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609e4bdc-3da3-4836-8add-11f5d0044a33/how_to_root_samsung_sm-t230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1fdb06-09f5-4e9a-bfdb-bcfb4d3fe7b9/7164352657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5984cf0-c95d-4372-a7ac-a0fc57a6e5b5/what_is_news_now_fox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cb6333b-0334-45d3-bfcc-db7b854a6f00/bexuriwixevoraporag.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.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 5420 bytes
SHA-256: c0ce328e5542fc49131320fdb85e84ab586ba6c443f840ada09f7f8516a9b687
font_01_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 11024 bytes
SHA-256: 74b587bfc1498f5731dc780ad37282d8258e606cb494c547e133b65d5d50892e
font_03_sfnt_off00013db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB4 11460 bytes
SHA-256: 0f37fdceefb74a64f0162b613171e6fab47f74eb1b30396a4b99a3f599bd3a14

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