Malicious PDF — malware analysis report

Static analysis result for SHA-256 e495d6d587b14791…

MALICIOUS

PDF

83.7 KB Created: 2021-03-16 20:07:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d020848a9206ca6a3ca136a680a67031 SHA-1: c5a129dfbf0fa21e859e2824510a5dc8ce39516c SHA-256: e495d6d587b147917595fba7f23642dfbbe5bf02bd435904202028a228dad2a9
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body, though heavily obfuscated, contains fragments that appear to be search terms, suggesting a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/123?utm_term=blackberry+keyboard+android+review In PDF document text
    • https://static.s123-cdn-static.com/uploads/4387711/normal_5fcbb9807419f.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/8xi47nl/gacha_club_oc_import_codes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_601a48c7456f7.pdfIn PDF document text
    • http://tunizunifegitof.66ghz.com/muscle_car_colouring_sheets_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/hghUmVM/denotobegor.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/CEeghFu/chicken_invaders_2_the_next_wave_play_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/8hdWjjX/1213000467.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/hajPgjN/42357578279.pdfIn PDF document text
    • http://redita.fun/pofutejdn9fg.pdfIn PDF document text
    • https://cdn.sqhk.co/nukasiwesex/KqjggcM/supermarket_mania_journey_how_to_stop_thieves.pdfIn PDF document text
    • http://idealica-italy.site/how_to_renew_my_drivers_license_during_coronavirus2xx94.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/gdb4iiV/54312075850.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ladesefutajon.rf.gd/bcma_at_ryan_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/application_form_for_wapda_jobs_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/wivefuboxali.pdfIn PDF document text
    • http://poxabeb.rf.gd/mufadesadovegaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/jujodonitojojamalowira.pdfIn PDF document text
    • http://takabewu.epizy.com/math-drills.com_subtracting_integers_a_answers.pdfIn PDF document text
    • http://jibitolokadidus.rf.gd/what_to_ask_an_intern_in_an_interview.pdfIn PDF document text
    • https://forums.androidcentral.com/showthread.php?t=864121&s=ab5cbbd8188ee49a036c567d7c29e2c0In 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
    • https://forums.androidcentral.com/showthread.php?t=864121&s=ab5cbbd8188ee49a036c567d7c29e2c0In 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 3016 bytes
SHA-256: 6b1886100909a5777bb30fc7b7be00bba8ed48ad5f5b392b7a0cb4783a0739ac
font_01_sfnt_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 4968 bytes
SHA-256: 6cc2d53d39cdeda06819978b5b8d500d3e4b303d173fe6154432b64ee55f31c6
font_02_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 10604 bytes
SHA-256: faec8c008b5550c09e0d86188e78abcbcae3ebdf8c4dc9d9e64e6cfe28bed923
font_03_sfnt_off00011cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 16392 bytes
SHA-256: 6dba5854a972f11ea50690dbd10bd732b527f03a7f02b22fceaad647e390bf0c
font_04_sfnt_off00013283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13283 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333