Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fc2d5c0feed5f4…

MALICIOUS

PDF

73.6 KB Created: 2021-06-14 23:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b81f6aa6afe9919c12f8ed0019b8ad34 SHA-1: aa407467549240aa79516e08531476f3888283c0 SHA-256: 41fc2d5c0feed5f4f2ac8444024704e73b858249487f1d0eb9a9b89a7a199d83
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The primary malicious URL identified is smidgel.ru, which is likely used for phishing or to serve further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/pbw?utm_term=digital+stream+converter+box+remote+codes PDF link annotation
    • https://wixilasiniwib.weebly.com/uploads/1/3/1/1/131163505/lezidajubazofeluruta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443576/normal_605799ba604ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494668/normal_5fdff589404d6.pdfIn PDF document text
    • https://lapunowelozod.weebly.com/uploads/1/3/5/3/135337348/xidixeponekavegid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_600b4c8ddfeec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_601cbc7144a5b.pdfIn PDF document text
    • https://jipunelokafup.weebly.com/uploads/1/3/4/1/134109215/tapogesatatapivelug.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/0387cab7-18e1-4afc-93d1-2c1bd5a2a81f/honeywell_thermostat_th6110d1021_troubleshooting.pdfIn PDF document text
    • http://fawugomem.pbworks.com/f/loxube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415f252c-c4c0-4053-8030-92573645fe14/things_to_do_for_acts_of_service_love_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0001e794-2514-493a-9939-cadd33c7ee9c/novel_outline_template_google_docs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccae57cc-21db-4eec-8390-345380ba1df8/87407792697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be55388-f65b-414d-b9e6-8c3dca5701e3/how_to_get_money_cyberpunk_2077_reddit.pdfIn PDF document text
    • http://kejufavo.pbworks.com/w/file/fetch/145183473/korean_tamil_song.pdfIn PDF document text
    • http://nitezug.pbworks.com/w/file/fetch/144671031/gojopuxavenudow.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144424284/spider_man_web_of_shadows_psp_free_download.pdfIn PDF document text
    • http://kedajawi.pbworks.com/f/94782878427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f591b95-7042-4614-97ea-d2cf691d1653/29215882304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbaeeb7f-4454-4dc5-b3d9-752b7ae33443/lomitifegidiwomomobepev.pdfIn PDF document text
    • http://xifatarege.pbworks.com/f/create_your_own_weight_loss_tracker.pdfIn PDF document text
    • http://zusemivak.pbworks.com/f/minecraft_apk_indir_android_oyun_club_15.6.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144423051/how_to_wash_my_milwaukee_heated_hoodie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b55aac5-d5d1-4b00-99b4-23be6c23c988/how_do_you_play_minecraft_java_edition_for_free.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_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 5524 bytes
SHA-256: 0ffcd838e57839b2b02ca8071c304d3d1f65750b7d7a0ab78d504b8d74b7bc7b
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 9976 bytes
SHA-256: 03031daefa0eb9361c7c554f3b1ed87a5281015ed2537f67926454fb408c577a