Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af104941db3b1a2…

MALICIOUS

PDF

82.4 KB Created: 2021-03-31 05:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1fad0e56aa44df975dd2aee2cd96e426 SHA-1: 3d28c9136767443d8f621f79b03bf9c4aaafce61 SHA-256: 4af104941db3b1a23ae7279c4aa0c659ecad71bff6c9083f874b8aa9b8cfda2e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and link farm distribution. It contains numerous external URIs, many pointing to disposable hosting, suggesting an attempt to redirect users to potentially harmful content. The document's structure and embedded links align with techniques used to generate traffic or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/wix?keyword=snarry+fic+recs PDF link annotation
    • https://cdn.sqhk.co/kakumipoman/ggEjbIb/survivalcraft_2_free_download_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/gcgIrs4/28661306099.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/9497016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_601e83a8e058c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_6051f50a93a0b.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/fhg5Eao/57943083618.pdfIn PDF document text
    • https://tonogedufeji.weebly.com/uploads/1/3/4/3/134378200/vinowejoseke-giwawuvirebipew-tejawitituwu.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/jsji1ia/best_praise_and_worship_songs_2020_mp3_download.pdfIn PDF document text
    • https://gulapizebulo.weebly.com/uploads/1/3/1/0/131070336/953d782bf5964d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fc5cd906953c.pdfIn PDF document text
    • http://visezuxopusifik.iblogger.org/beacon_academy_grimsby_uniform.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_5fe76cc3b1f59.pdfIn PDF document text
    • http://lipejunotuxo.22web.org/gaggia_classic_pro_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuparit/Bgcgejc/vufasumitom.pdfIn PDF document text
    • https://cdn.sqhk.co/gijimexuv/cjjRibO/stack_buffer_overflow_basic_1_root_me.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://lobulowigewimu.epizy.com/character_creator_software_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e16371-fd73-4cac-9df4-af78661c1a6d/juzematuludetarezijegevet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74dcbd4c-c86e-463a-a8a8-47589117c136/soralilefelam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35ea53f-b87a-4b3d-8944-ef09d3fcf62d/how_much_is_a_one_zone_bus_ticket_for_nj_transit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097529d6-cea5-4c3b-af04-9a2682c5b1e8/ar_15_magazine_coupler_10_round.pdfIn PDF document text
    • http://zufitarevegu.epizy.com/85568085047.pdfIn PDF document text
    • http://xosekipile.rf.gd/42637530080.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_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 4648 bytes
SHA-256: bd4cb03801e4f5a67a4a6c8c4eecb00cd3502ceca4eeecca84bd8a1d99e981c6
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 10684 bytes
SHA-256: 3692f1a11930d39fade26f6a3269618c204bf8b0ef7ea744976c5efd9938e7de
font_02_sfnt_off00012e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E14 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230