Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a256f3d579a38b2…

MALICIOUS

PDF

81.2 KB Created: 2021-03-14 23:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 88292dbb8d8ca3c604a0ee9e361e901f SHA-1: 5b494fd8a19357fe15e35de035ab1a4f19538058 SHA-256: 2a256f3d579a38b23f4c2bdd7e159f7b696dbf1703be41261174ce6a54bb3dd6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9994

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=7+baby+steps+dave+ramsey PDF link annotation
    • http://bonboxstudio.com/sijemuxijobigalakerutecqvqw.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/1635309.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/88601802063.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/0hbxh4J/the_walking_dead_michonne_game_voice_actors.pdfIn PDF document text
    • https://peketodofow.weebly.com/uploads/1/3/4/5/134589962/kixemizomaxav-werumem.pdfIn PDF document text
    • http://polnews.xyz/31034833960qsam0.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/firorebilaz_muxuz_kawenuvozosob_dujavutamokix.pdfIn PDF document text
    • https://sesumevikenaful.weebly.com/uploads/1/3/5/3/135346106/kevelosu_tivonixivipa_pozojo.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/AyhhxRI/kiwi_browser_fast_quiet_for_pc.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/94243225097.pdfIn PDF document text
    • http://jesawukimefix.mypressonline.com/awards_and_honours_2020_download_in_telugu.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/sugim.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/8921b4a3-72f7-409a-aba8-b95901a690e3/79102235034.pdfIn PDF document text
    • http://woxesizefibugel.atwebpages.com/o_cavaleiro_das_trevas_hq.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e057da9-97b8-45bc-85ca-ed03d89f3ba2/82119837531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db581ccf-1d09-4f9e-9b18-fb9c7a70a315/42537015268.pdfIn PDF document text
    • http://bepolujogox.atwebpages.com/69290603743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d9e18f-157f-48ac-abdc-8f23bf794197/is_freya_odins_wife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b2d6a4-abc5-478c-9538-091e329dd41f/86081920633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f89d4c2-9d21-4bd3-b3cc-6a50df74e285/vitadeseku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f88363-4b45-431f-8527-ca2f9aeebe57/how_much_does_a_replacement_tooth_crown_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3bbbb6-1614-4e93-aada-92880a8f38d5/13115246772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f06cc98-19e4-47e6-93ba-4e5f55b95a4a/what_kind_of_batteries_do_fire_alarms_take.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_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 5360 bytes
SHA-256: 9386cf25275c429d687a8aa9e1101b37cf332eed5c5a6cfed0dfbed5ab37585a
font_01_sfnt_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 11192 bytes
SHA-256: 7d2531ff94ceceae74a21c84865a6161b5c947d0531f1fb1a0bada6aa1663ce5