Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac461b3870c1e95…

MALICIOUS

PDF

80.5 KB Created: 2021-03-15 11:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 70065e252cd2c2e0fb5893759ff6fb76 SHA-1: a1863f6709f8333482c5a9c6bd392af04452d7fb SHA-256: 1ac461b3870c1e957a8bf7f3d8c9f685293f27d484e07ccb44b36fe63db72e2b
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable domains, indicating a link farm designed to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs likely serve as redirects to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=black+and+decker+hedge+trimmer+cable+replacement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368494/normal_603d0558e4419.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/baguio_city_map.pdfIn PDF document text
    • http://kujinatazema.sportsontheweb.net/xixevaxivegujerawonelib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375195/normal_5ff7c2dc23b82.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/suxamokometelesuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_600d2663143e3.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/sony_rx100_mark_6_specs.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/newalizujojavumufesuvo.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/big_fish_audio_momentum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_6021ebd6706eb.pdfIn PDF document text
    • http://davorivugexawu.sportsontheweb.net/lg_smart_washing_machine_error_codes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_602cf3fe341ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_373588c355c742a1864c75aa08cedf75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/53808825282.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/78215285421.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_b8cdf67838504106bd2acd84526b3b5e.pdf?index=trueIn PDF document text
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_adb1f948c8154d5db021b50796b8b11f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/37548236178.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_f75f86025d354810ad2418173542a527.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_6f6699783e5b4b00808b1e631f91ec60.pdf?index=trueIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_a32672e106d6440089dbca8dba586cd4.pdf?index=trueIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_70905739c75c413191a44f135a8a81f3.pdf?index=trueIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_3d21fbc7fff1481ea65bee94d0142d54.pdf?index=trueIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_59b10f15c50d43b2be05822dd1cd85af.pdf?index=trueIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_184c31ea6d0e43969ea91f5e7eb97828.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 3488 bytes
SHA-256: 47b57b2364547d8598f2bdb7df7059a67e79c3981864ae66996749944a51b5b2
font_01_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 5560 bytes
SHA-256: 65cdd22b33c74f0f957e6b1b794e80bc12ed64c21828498bbcc98d9955adeda1
font_02_sfnt_off00010cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF2 11384 bytes
SHA-256: 2a9c2a7401bc52af03cf99c90ed0aa317fe7ca889e16e3bd398c51cd4d607c1d