Malicious PDF — malware analysis report

Static analysis result for SHA-256 166caa699efdaa0b…

MALICIOUS

PDF

84.0 KB Created: 2021-04-08 07:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aef62861bcc171cd37f533d97b90b71f SHA-1: 590209dff46f5abceb938a38b0903f2d156ecdfa SHA-256: 166caa699efdaa0bdb9df609a36a86833b5255ed7bd4f76352c92f255470ee00
196 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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.
  • 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.
  • 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://maypoin.ru/strik?utm_term=what+is+law+101 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498376/normal_6049c311cac20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_60339ea6c938e.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/725b5daa-5eb4-4772-a8df-dfe10daed52d/degakedofe.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/cydia_free_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1da9df4-31b6-4c20-8f95-0409a84462de/24919767250.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/14064669586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136931a7-2038-463d-864a-22f496615696/average_salary_of_a_architectural_and_engineering_manager.pdfIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_a0a9397335d24071a8ab540b97061085.pdf?index=trueIn PDF document text
    • https://f1fb087f-5d49-4061-aa02-230b108315d3.filesusr.com/ugd/645068_2d31df38e0dc4bf581640136030b87ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2f2f0b-e284-4277-a416-13b3b79de343/53923447503.pdfIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_5bdc0636b4b04276a739faccf4ea7f33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe6f365e-a93d-4337-992c-1eda56e49388/run_powershell_script_on_startup_windows_10_gpo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6811d17d-294e-48c1-a174-b5a845ceb655/does_walmart_delivery_accept_ebt_cards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4229b3f-52d3-4181-a3db-38b0e48c4ad5/cuales_son_los_sintomas_del_cancer_a_la_piel.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_b8fd0172790c48abbe3d6fbd4ba16452.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_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 4976 bytes
SHA-256: 9124b3c16f36bedcfe7645de64a0b40e438738a360be6e0216c18d1ba80d96a7
font_01_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 10860 bytes
SHA-256: 539427e7f7deac8790372481eb5ccca41c73783d0f02170d9c7b444607264a25

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