Malicious PDF — malware analysis report

Static analysis result for SHA-256 7918ecab30b6e35f…

MALICIOUS

PDF

78.2 KB Created: 2021-04-12 00:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 40fc9837ca842fcf4e34e197fd8af993 SHA-1: 199ad20f0d58a014bff483430be4b3e0dd2079ba SHA-256: 7918ecab30b6e35fc36f0418b4f070adb0c5b0917188b205301a4b0c52cefbea
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 0.9961

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://jottigo.ru/strik?utm_term=5th+grade+reading+workbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375356/normal_600420670d3fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_604e9d8e30d63.pdfIn PDF document text
    • https://cdn.sqhk.co/topazawu/jbez41I/tiktok_app_icon_aesthetic_black.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501794/normal_602b8297cebaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_6023f09772b7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_6069234b24b57.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/kjegi1c/wibokotolem.pdfIn PDF document text
    • http://giliroder.iblogger.org/63473461969.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/FWaOZib/groupon_merchant_services_contact_number.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/e4jahhA/cheap_roundtrip_flights_from_chicago_to_las_vegas.pdfIn PDF document text
    • http://sizoxuk.22web.org/suwetanuzavuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulegezusaz.epizy.com/analysis_of_quick_sort_algorithm.pdfIn PDF document text
    • http://fobeguwimot.rf.gd/xiwomixe.pdfIn PDF document text
    • http://tobizexajivuvob.epizy.com/midefepamefove.pdfIn PDF document text
    • http://vapanuwivodoj.epizy.com/aapse_milkar_acha_laga_mr_jatt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1bc2315-5929-4f2c-9d4e-f862ae142567/27235353793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cc0cb3f-18c1-4749-8190-d7b0ab4f1832/dirt_devil_power_max_pet_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd38bd0-63c2-4b0f-a298-ae3785eef222/max_lucado_you_will_get_through_this_quotes.pdfIn PDF document text
    • http://fimomisuv.rf.gd/76191979452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5e1a7b-bc0f-4fcb-9b5a-10b3c57d9b02/words_that_start_with_z_in_spanish_and_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4394de-a196-4b56-b531-86785d894fce/elementary_statistics_9th_edition_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c5504c-ac7b-47e8-b9ab-0b30c90fc621/vigosow.pdfIn PDF document text
    • http://mopasaz.epizy.com/duzeputixuv.pdfIn PDF document text
    • http://baledur.epizy.com/ssc_gd_admit_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c654d11-1cbd-4090-bdff-b710df4c60fe/91852428000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51f660b-4804-422e-8185-c7517d004505/learn_to_read_hieroglyphics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6284558e-1e69-47bd-a5e3-d4d2e95a23d8/jiviropav.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_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 5420 bytes
SHA-256: 13559a2be6456546e8b4d73b684316b4298bc18840a0b03b8040afdcbab9f6e3
font_01_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 11168 bytes
SHA-256: 5303a3b276440522b87138f4fa5fbb844bf02bd2bb17c39ba4d930d33f27d965