Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b399c69ec2e4b41…

MALICIOUS

PDF

113.8 KB Created: 2021-03-24 09:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 56c2412dda92497db879a79094fad10a SHA-1: 8b3959dda45d72aa5a1b04d09f59428c07642555 SHA-256: 3b399c69ec2e4b414a9f2be1ceeb91c236b9e917f5d429006202d3f183e1b355
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 0.9995

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://golowaki.ru/strik?utm_term=troy-bilt+storm+2410+parts+manual PDF link annotation
    • http://instapriz24.site/what_does_the_quran_say_about_punishment_in_the_gravemjfir.pdfIn PDF document text
    • http://tryadasert.online/kotododalelirigujuredaposnrfe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_603f53798798b.pdfIn PDF document text
    • http://zhk-samolet-krasnodar.info/can_you_manifest_someone_falling_in_love_with_you1u7i1.pdfIn PDF document text
    • http://gaydating.world/where_to_buy_total_gym_replacement_parts2gu4g.pdfIn PDF document text
    • http://dupesagefad.22web.org/bernina_record_830_manual_free.pdfIn PDF document text
    • http://tasefuvakol.22web.org/23557065632.pdfIn PDF document text
    • http://vusovomavil.iblogger.org/the_art_of_storytelling_by_steele_text.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413976/normal_5fe5d2215363a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c5de5a-3edc-4f72-925d-df49f4245fad/nojenazonesuxegen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c197a6c3-a52d-4d33-ba2b-4da34a2d1c06/yvain_the_knight_of_the_lion_graphic_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d9a1e1-dd5e-4ba3-ae01-5f238ba4f2fb/everybody_lies_indonesia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55eeea14-b497-4e78-8ae3-76ebf9faa016/how_to_understand_the_bible_more.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ccb14a-56e5-459e-8633-2ad2d9f59752/2nd_grade_math_worksheets_addition_and_subtraction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26a3be0-d4ab-4b34-9a7a-b44e92148970/summary_of_cien_anos_de_soledad.pdfIn PDF document text
    • http://kivekedifewu.rf.gd/ponakewiluda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfdfba9-dc0f-4d96-bc17-01cff54a8832/flight_engineer_salary_in_sri_lanka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d12458b-2829-4233-af75-7de991811b8e/the_waverly_theater_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b373c352-f49a-4487-b014-8361bd99aca0/navien_ch_240_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7d59ea-76c8-4fbf-91f6-65a26b43a92e/rules_of_tajweed_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52f0ff0-37e5-42b7-a531-ff87e0c64464/vetunumigota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad59aa57-d138-493b-98dc-396fd00c5646/how_to_reduce_high_blood_pressure_naturally_at_home.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_off00017f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F54 5600 bytes
SHA-256: c555906fed62909bf359e592b9844052dcb208703c89be356aa60ff414a473a8
font_01_sfnt_off0001925b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1925B 10928 bytes
SHA-256: b96e48e72b251f72c791010c3a645ec39dcf41500c878a35d3503fdb2ac49af5