Malicious PDF — malware analysis report

Static analysis result for SHA-256 5272617bc5ed5cb0…

MALICIOUS

PDF

81.8 KB Created: 2021-03-17 12:55:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a7b3dda2fbe8ef5ff87c51ef5a2b1c28 SHA-1: 244d8a77e732f0773fb4c07809ecafaeda6d8e22 SHA-256: 5272617bc5ed5cb0e73e3abcdd44ca6ca9d82ca4b2b9a2470c061d8f44702808
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, indicating the document's primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=clergy+housing+allowance+resolution PDF link annotation
    • https://cdn.sqhk.co/nevupediwix/feijibm/memewo.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/gPhh2jd/vaxagavujewabuvuw.pdfIn PDF document text
    • http://merovew.xyz/987388962533u959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5fd9f220caaac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484380/normal_600659f57bd2a.pdfIn PDF document text
    • http://trylait.club/delonghi_ew7707cm_safe_heaterx9coh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489980/normal_600d982751823.pdfIn PDF document text
    • https://cdn.sqhk.co/lefuwaregew/iehekhc/vshare_iphone_no_jailbreak.pdfIn PDF document text
    • http://m-ryanaf.site/how_much_does_comcast_charge_for_just_internet2o5q9.pdfIn PDF document text
    • http://trysoda.pro/64994579204up7j5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445118/normal_5ffb3ababd984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_60351894ba1be.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/gjooahe/stick_warfare_blood_strike_pc.pdfIn PDF document text
    • http://italy50wow.pro/adb_reboot_android_emulatorl5bli.pdfIn PDF document text
    • https://cdn.sqhk.co/gumakulex/iw13hft/63099831237.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://rawigukegopafot.onlinewebshop.net/jixetobamimunit.pdfIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_16b2474282d945bf8cf558e50ce86338.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f890f9b0-e7cd-4976-bbef-7ad216c2c451/what_is_pre_arrival_in_hotel.pdfIn PDF document text
    • http://misanedajog.myartsonline.com/85059362536.pdfIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_18697f6d790e447c8050eb24e7b1b0ff.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_72e73b2ebefe42b0a2edea759a87a5e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/942db1de-082b-402c-9a64-b9e9671e29cb/refovo.pdfIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_37920a4a9edf46e2be4a6d90b313275f.pdf?index=trueIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_57cd0a7df8974338886117e4cf53ebf6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1483e7e0-82ba-4fb2-b30c-9e248863c73e/nurotujudeliretodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc5ec00-3437-4ae4-86df-fb83e2d5b9c6/17240682897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2631f07f-eeec-4fc7-9172-070069f05e01/why_is_my_epson_printer_beeping.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_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 5160 bytes
SHA-256: 80494568fb3e41584045e3a7f0b3f711b0d81c08dcbf6f1e02ce9042577e7f5c
font_01_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 11060 bytes
SHA-256: 945faa57303a3093fdb514bc320c5eca636c1cdeb2a9f8f3c4d13e69a63831bd
font_02_sfnt_off00012af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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