Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2831bc18cf6ba4…

MALICIOUS

PDF

74.1 KB Created: 2021-03-29 02:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b1e9bd6aafdd1aeb10d04fdbc2665d2d SHA-1: ae9df307255faafa1d87b3135fe929949675c0b9 SHA-256: 1e2831bc18cf6ba40cfbaeb877f1324c245eb8ab636ae15d3d73fe0d67446c08
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, references 'ocarina of time debug rom download', a common lure for distributing malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=ocarina+of+time+debug+rom+download In PDF document text
    • https://povisegidugukab.weebly.com/uploads/1/3/1/8/131871963/3022872.pdfIn PDF document text
    • http://zatorigixoluji.iblogger.org/bgp_protocol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_601bc286cc55c.pdfIn PDF document text
    • http://rekabiw.22web.org/jazz_piano_for_beginners_sheet_music.pdfIn PDF document text
    • http://lipatajewaxo.22web.org/zunekutik.pdfIn PDF document text
    • https://zuwuwuxi.weebly.com/uploads/1/3/4/8/134883554/54607.pdfIn PDF document text
    • https://nasoxuxelaleve.weebly.com/uploads/1/3/4/7/134744481/0763f9da01e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_602c57a441852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_6028791cb2211.pdfIn PDF document text
    • https://romizipomubem.weebly.com/uploads/1/3/0/7/130775952/zebuxarowu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/567266ba-f17e-4f17-af8f-bb15febf493d/xowirajiloxib.pdfIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_90ea942775b1491b94dde95eaaa54358.pdf?index=trueIn PDF document text
    • http://vetarobafawuk.epizy.com/rogudofewikujovi.pdfIn PDF document text
    • http://wapolijo.epizy.com/depifojupoxipogusib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d010ed-6341-4f39-b1e6-fc4d090b05c8/how_to_win_chess_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0532358-7811-4602-9b43-fd689a749021/kipebonegizesurifok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54989a63-20ee-4d61-8bc4-3ab14610f41e/75450224710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a12f0f24-feaf-4993-acf6-15aaa08dca10/34140293799.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_c857774e8f5240059d43fb65541ea62a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b799b77-2f27-42b7-b71d-764b5fd9a45a/lg_inverter_v_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c96b60-dd0e-4e57-9640-86fb91aadb3c/how_to_draw_a_cartoon_nose_from_the_side.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1bdcd86-df10-4085-95e7-14f7fb293233/vusepowesimopizos.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_ca2b01a4cc90403fa3c8d5589160e4fd.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 5424 bytes
SHA-256: 18f76fc47bc4d27fff41fbaf8410f59aa25eb97aa5fce6d88812eab9aa9c2c91
font_01_sfnt_off0000f2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 11548 bytes
SHA-256: 939289f10dd99764c3b3410e28c53a98b2d0fff952bbb082bc8b8016e2d1644e