Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a44f5ac716dba1…

MALICIOUS

PDF

76.9 KB Created: 2021-04-08 02:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 32e99600fbcd73267e7afe8ff3fe198e SHA-1: e97899bb11e5797b4f6096297fc708585e4f9bfc SHA-256: 29a44f5ac716dba1e4dfdc84bcb2ed08beeed4c1ffe0628693d926d0b92f2e6f
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/123?utm_term=chunar+song+dj+remix PDF link annotation
    • http://lorubuxetorifa.medianewsonline.com/buddhas_brain_chapters.pdfIn PDF document text
    • http://lipenav.mypressonline.com/93411054952.pdfIn PDF document text
    • https://wakebanimoxebej.weebly.com/uploads/1/3/1/3/131383753/rirowewelimab.pdfIn PDF document text
    • https://gitakitopawal.weebly.com/uploads/1/3/5/3/135325500/9869939.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/nidenixenajevo.pdfIn PDF document text
    • https://gagavupotiwek.weebly.com/uploads/1/3/0/8/130813998/6489314.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/cd55bf73-1e1d-4a28-8fb7-65bbf5d5ce5e/cos_180_degrees_minus_theta.pdfIn PDF document text
    • https://543e2b4d-9699-46d2-9656-875e860b8e63.filesusr.com/ugd/fb32d0_8ee8d005f6d84f90871cb2f5bde39cc4.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_351786e28b1a457cb34e3a8549d1f90b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31058c6b-7561-43f5-aad0-98d1e001d2be/what_is_the_cost_of_onstar_services.pdfIn PDF document text
    • http://kibagog.onlinewebshop.net/statistical_analysis_in_excel_2020.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_0232b8de6d9c463d923f79f2e769adce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0eae821-a4cd-4384-b174-afaec92de7a9/malikekatonapebixu.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_37e985c163d84b4d8a421ef6244d70e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f90f4b7d-7f19-412d-bc39-9a7d11bdb3e9/o2_sensor_voltage_to_air_fuel_ratio.pdfIn PDF document text
    • http://pimobepetokonud.myartsonline.com/arrl_antenna_handbook_download.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_4c44c2823da64d958039e816ba52db63.pdf?index=trueIn PDF document text
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_05c27fe17a6a4be19197e9e4b84605b9.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_b1d8f38f1ed745a6ae8b20878dc3591d.pdf?index=trueIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_0aa02187ff87406585bb8355de19d7a5.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_bbdaee53268f4e8f98912beaaae76d81.pdf?index=trueIn PDF document text
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_dc6ad1291eb7456cb197a913164f5c1c.pdf?index=trueIn 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_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 5256 bytes
SHA-256: 11214bd4b2b26233f0e039cd7fd72beea5965cbc05cf375a4624c1e5a4a075ab
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 10604 bytes
SHA-256: ddc10a806ebe5399f2f82b92a146d1752207ea71dad0e3e4f9c25cdf39e0e8d3