Malicious PDF — malware analysis report

Static analysis result for SHA-256 8538238292a421c6…

MALICIOUS

PDF

83.5 KB Created: 2021-04-08 23:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1e93c9123f106d10a791f5494b11431d SHA-1: dbd03b03ff074f13443490d08c4e7d4b0e038669 SHA-256: 8538238292a421c61d749eb1261d461aaf944f20b6f1c5a717dabeb0a3a22437
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 one critical link to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scamming purposes by directing users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/strik?utm_term=how+to+do+realistic+portrait+on+procreate In PDF document text
    • http://widesez.iblogger.org/how_to_descale_cuisinart_k_cup_coffee_maker.pdfIn PDF document text
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/9665409.pdfIn PDF document text
    • https://pijaremurepapo.weebly.com/uploads/1/3/1/4/131406688/govujanazamojiv.pdfIn PDF document text
    • https://gidafefutor.weebly.com/uploads/1/3/4/0/134040883/626383885ffd5.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/kuladodebenojip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_5e6885925d124dcab1ce2e0530ba5e4e.pdf?index=trueIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_679787ffaf5d412ca22eca4b336789d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd91f2d-0bf2-42c9-b0c3-da2d974143f6/words_with_roots_grad_and_gress.pdfIn PDF document text
    • http://pavunununege.epizy.com/brawl_stars_hack_version_free.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_57895c0e7875427d859c24837e094e9c.pdf?index=trueIn PDF document text
    • https://fdf0fb27-5181-4190-8e1a-80fb86d87eb1.filesusr.com/ugd/2410c9_6bee715f95404219ba1ae159cd7c4072.pdf?index=trueIn PDF document text
    • https://f24a1476-17ee-42e0-ab44-5f370754282d.filesusr.com/ugd/3835dd_101881e9ea1a47d9856ab8a071112cfc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/71477281541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650df7f7-1dd4-4a55-b6fc-dc56f482ff1a/life_expectancy_of_lennox_pulse_furnace.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_89b609e969a040649f126eecff6fdb3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/68778835509.pdfIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_8b4aa0d3ec9e4f38ad3d32a4e1f04494.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a185eb-3c41-414d-8c34-b41025e63105/twilight_4_full_movie_in_hindi_download_720p_filmywap.pdfIn PDF document text
    • http://pewaxoxepizus.rf.gd/game_blur_apk_data.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_10154a92eb7c48f0a2034cb00e3310a8.pdf?index=trueIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_215edd0c546f473ba46433edf74eaa4c.pdf?index=trueIn PDF document text
    • http://tekufokejogarik.rf.gd/functional_groups_in_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/ridgid_miter_saw_parts_ms1065lza.pdfIn PDF document text
    • http://tuzotulerijenej.rf.gd/anthony_dasan_nattupura_song.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 5120 bytes
SHA-256: 1e9de62980e4925a6558a37279ffbf6b99a0823a29e7c2a047877275ca067f4f
font_01_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 10312 bytes
SHA-256: caddb3c0cc9270fb64c42c0ab7ee69955a6bf92ec4c59e1e32086d8b847d0584

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