Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c6f91baef7338c…

MALICIOUS

PDF

81.2 KB Created: 2021-03-13 21:17:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c165ef37982dd7dc1735056c17905446 SHA-1: 91f70ef9be4f99c11e5bf8cb2288ad591bcdad7d SHA-256: 23c6f91baef7338c4fceca26402173e1dc77933b02fe69c52e3b200671aefe84
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 0.9990

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://jacksth.ru/strik?utm_term=2013+subaru+impreza+sport PDF link annotation
    • http://pshcomonhere.xyz/alaska_dmv_learners_permit_practice_testdh4um.pdfIn PDF document text
    • http://lg-copyright.com/classical_myth_8th_edition_summary0k3df.pdfIn PDF document text
    • https://semukozev.weebly.com/uploads/1/3/4/4/134493414/fd77fb0a9d618.pdfIn PDF document text
    • http://busforpay.online/876651751195vc07.pdfIn PDF document text
    • https://putoxovomugov.weebly.com/uploads/1/3/0/7/130739063/kudazesuzodijojiz.pdfIn PDF document text
    • http://fringigejy.site/2781273651879thd.pdfIn PDF document text
    • http://maska-respirator.com/wipamoposazamisamadr2e68.pdfIn PDF document text
    • http://sabumow.mygamesonline.org/zemeruxojiwafawadepuza.pdfIn PDF document text
    • https://zafudibibini.weebly.com/uploads/1/3/4/1/134108698/6d0ff9.pdfIn PDF document text
    • https://fapufeloku.weebly.com/uploads/1/3/1/0/131071019/komilivedexagu_lazoguzavijab.pdfIn PDF document text
    • http://beliyden.xyz/what_are_the_characteristics_of_gothic_architectureg4qys.pdfIn PDF document text
    • http://krepezh.guru/6126728790hu8gi.pdfIn PDF document text
    • http://firstsecu-paypal.com/brother_hl-2270dw_driver_canadazydd8.pdfIn PDF document text
    • http://ehaberdevlet.com/dibufatarakawakifijuzeg0q5d.pdfIn PDF document text
    • http://serviceforyou.site/87725871996qswl3.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://wonanikapudidak.atwebpages.com/belkin_ac1600_db_wireless_router_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8747e086-61f1-483c-b7bb-17a3572be85b/jumanji_epic_run_mod_apk_1._4._0.pdfIn PDF document text
    • http://vulopekusape.atwebpages.com/aa_meetings_near_my_location_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d629a4d2-45c0-43aa-9c2d-a936a8169a09/vaful.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/langston_hughes_merry_go_round_analysis.pdfIn PDF document text
    • http://kewetanetoza.atwebpages.com/butterball_electric_turkey_fryer_oil_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f02d09-0801-4c4b-87cd-47af76a81ed1/kuzanevotozebatisidobex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd4f96eb-7bcf-4e91-b970-a32441d07595/organic_chemistry_lab_report_introduction_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d92cfdcd-5eec-476b-bde7-030f92440df0/where_is_the_filter_located_on_my_keurig_2.0.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_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 5296 bytes
SHA-256: 4c17418e27a47490116765a2811638c87764d7d8fd45d11ac8e57fd972014a99
font_01_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 11056 bytes
SHA-256: 4532bad91028d6531f43370a1b5e5aff5450bd2daca6e9f73ae0bc1396f6154f
font_02_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2