Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37de6c0392131dd…

MALICIOUS

PDF

94.7 KB Created: 2021-03-28 20:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0149c82326f30879c9f5039a8785eac1 SHA-1: 539c1a0972a7e5caf9e816fc178236ddc2c450e5 SHA-256: c37de6c0392131dd62675fd4bf863169f5b656ae8ae0e8a0a0edf054a91d06f4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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/award?keyword=ncert+biology+class+11+text+book+pdf In PDF document text
    • https://cdn.sqhk.co/fabunavaxa/gecjhM6/37633294542.pdfIn PDF document text
    • https://zarojapejafaro.weebly.com/uploads/1/3/5/3/135347044/wudalid-fodomet-xinisejogipekow.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuxedodi/jNHggZ6/freezero_game_hack_download.pdfIn PDF document text
    • http://7lessons.fun/whirlpool_accubake_oven_owners_manual9kps7.pdfIn PDF document text
    • https://dawopurasujup.weebly.com/uploads/1/3/0/7/130775219/1016624.pdfIn PDF document text
    • http://gprofights.ru/game_theory_applications_in_real_life9rf9t.pdfIn PDF document text
    • http://hurleyshamburgers.com/31650405949dnrx3.pdfIn PDF document text
    • https://serogewuf.weebly.com/uploads/1/3/4/6/134615077/wetuzoxekux_gibebekotoxogok_namebonusaxozit_suvefurodomu.pdfIn PDF document text
    • https://dojobojijiwum.weebly.com/uploads/1/3/2/6/132681334/menofobodikatuju.pdfIn PDF document text
    • https://dexuwoborusise.weebly.com/uploads/1/3/4/3/134375282/luredupagilos_vijakejadap.pdfIn PDF document text
    • https://cdn.sqhk.co/tawunipufop/giuFBjb/carry_on_mr_bowditch_full_audiobook.pdfIn PDF document text
    • https://dowibowaxetejoz.weebly.com/uploads/1/3/0/7/130740522/potofegu_jenogem.pdfIn PDF document text
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/gamodasatigukutor.pdfIn PDF document text
    • http://getsol.xyz/63071130173qkl1e.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/hBbgc2K/100_orange_juice_save_file.pdfIn PDF document text
    • http://rakedotizem.22web.org/alabama_football_2020_schedule.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
    • http://jodamedorofile.epizy.com/xemuvejuvafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03d07d0-f1c2-4dd6-a39d-328d1e7ed133/21661589096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5196235f-ae58-4f5a-8ebc-79c7fb30e1b5/problemas_de_salud_en_mxico.pdfIn PDF document text
    • http://mudepenota.epizy.com/29836659175.pdfIn PDF document text
    • http://feloxokarapuj.rf.gd/characteristics_of_information_security_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c4f36f-4b5d-45ae-ab1c-2883ea1dd491/tronical_tune_battery_pack.pdfIn PDF document text
    • http://wuwepapose.epizy.com/77281127427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83714821-9311-4e7b-93fe-11772dacf939/how_to_use_duracell_power_bank.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_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 5720 bytes
SHA-256: 1bab7bbdec75e7cdb1425356155dbf38d413ed61b56e56a7d72e659f53d33d70
font_01_sfnt_off00013861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13861 11752 bytes
SHA-256: 90d11865a8c0f4138b18895757e6702c2205d41840ce3bc9c0edac96c4d128c2
font_02_sfnt_off00016077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16077 3060 bytes
SHA-256: 64d8c22c8d37e77389ba11168dc19ee95ec2be9b4471c069115bb8f89ef30eff