Malicious PDF — malware analysis report

Static analysis result for SHA-256 04244d9812eaa2f6…

MALICIOUS

PDF

95.3 KB Created: 2021-04-16 22:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 00e25f8b516e27f60a0d8e75e3874ddb SHA-1: 94a85922e6a681a967bed2ab3e5ba3b29406f0f4 SHA-256: 04244d9812eaa2f6f76b8700ec1265e69a3b13f362b3307b5679a01849e92146
226 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. It uses a LOLBin command-execution lure. 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 0.9998

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://botokaw.ru/strik?utm_term=anti+deep+freeze+8 PDF link annotation
    • https://jaxiweweso.weebly.com/uploads/1/3/1/4/131437584/kekawudatiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421215/normal_604e8c5a798e8.pdfIn PDF document text
    • https://sokazavuse.weebly.com/uploads/1/3/1/3/131378988/butawo.pdfIn PDF document text
    • https://merogowaxoku.weebly.com/uploads/1/3/1/0/131069891/bugugaromusowe.pdfIn PDF document text
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/nimetonenoxefal.pdfIn PDF document text
    • http://pojesuwemi.iblogger.org/fezanepodekobemudewur.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/terutafoduji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_5fd672dbd9f08.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/7127bf34-1869-4aeb-bb93-d5a7f7ce18b5/jambox_mini_portable_speaker.pdfIn PDF document text
    • http://fogaweja.epizy.com/46287320517.pdfIn PDF document text
    • http://fezexebu.rf.gd/how_do_i_reset_the_waste_ink_pad_on_my_epson_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d6940c8-6960-45c7-a7de-8fe3ee436d57/kirukenurunitidajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22a1a653-a89d-4b5c-bcae-a367c1a567e0/how_to_maintain_s_curl_texturizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19950433-0cd7-469a-b082-9899923bff32/java_8_features_with_examples_for_beginners.pdfIn PDF document text
    • http://pibanexotobove.rf.gd/bosch_hydrosensor_dishwasher_manual.pdfIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/ce74f478-6076-4c4e-9331-938f0270b9cb/4021817138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a985a80-81ac-4f53-aabd-df62cfe0be8e/59572420504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20fd5be2-6b4c-44ff-bff6-54b3b9aea5ff/what_is_the_primary_purpose_of_report_mcq.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
    • https://uploads.strikinglycdn.com/files/In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13890 4848 bytes
SHA-256: 3e2d8a72f13a83650813403c42cca967e38f1a97cc54faccb2b09a9375ccb2ac
font_01_sfnt_off0001492b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492B 11588 bytes
SHA-256: 8e92fd3f818d2f8ca5e42562ee47294d2a173e1edfac31ca09dde41e33ab42ad