Malicious PDF — malware analysis report

Static analysis result for SHA-256 a780c0061d83d812…

MALICIOUS

PDF

78.2 KB Created: 2021-03-31 11:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9df4dc0e77c92708453ad78d3500014a SHA-1: 591517394aa2c63de6aff703d8ecec2184ac233a SHA-256: a780c0061d83d812f05c7ab2cee9b727f9423c2c8be350a1c7fc319cc2a5aea4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://fokemale.ru/award?keyword=anexar+pdf+no+linkedin PDF link annotation
    • http://vilopeg.xyz/grid-_template-_columns_1_fry04ay.pdfIn PDF document text
    • http://marafonsport.site/how_to_tell_rheem_water_heater_agef0y7v.pdfIn PDF document text
    • http://chebsvet.ru/how_do_you_install_a_hot_water_recirculation_pumpmcmzl.pdfIn PDF document text
    • http://busforpay.online/david_Stern_Bedeutung_Symbolikpplvh.pdfIn PDF document text
    • http://jibakerutev.mypressonline.com/mubatojunakis.pdfIn PDF document text
    • http://test123test.xyz/maze_runner_series_in_order1odgd.pdfIn PDF document text
    • http://ogranicbio.space/vampire_diaries_cast_season_8_twinsusrtb.pdfIn PDF document text
    • http://normaa-id.com/boss_audio_r1100m_riot_review27uqt.pdfIn PDF document text
    • http://busivel.xyz/joe_f_gurneyoj2ao.pdfIn PDF document text
    • http://jirolor.iblogger.org/27255803754.pdfIn PDF document text
    • http://meetchat.space/723683085732kzyk.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://rowoniwetob.atwebpages.com/22844618497.pdfIn PDF document text
    • http://kevuwibevuvibor.epizy.com/pabovidewifubopaj.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/dazasulejoridonijinenun.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/11914948002.pdfIn PDF document text
    • http://potutanevoje.epizy.com/radial_head_fracture_exercises.pdfIn PDF document text
    • http://lidudoxodirabi.rf.gd/44084570862.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/fiddlesticks_beginner_guide.pdfIn PDF document text
    • http://wovuluvoju.onlinewebshop.net/personal_autobiography_sample.pdfIn PDF document text
    • http://bagozorox.rf.gd/how_to_start_the_heir_of_memories.pdfIn PDF document text
    • http://nuzikenevizut.onlinewebshop.net/shine_on_crazy_diamond_tab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 4684 bytes
SHA-256: 91f298c270a4a185046d262fed73d38aa381dfd983cdb450f4a92c5c22e8d6ab
font_01_sfnt_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 10524 bytes
SHA-256: dc645636e2bc61bd5eb10681c46a80a6c96c61b1a2d75ae4898d8e153b6627cf
font_02_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333