Malicious PDF — malware analysis report

Static analysis result for SHA-256 997a4add11eb4143…

MALICIOUS

PDF

75.3 KB Created: 2021-03-01 16:31:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6e1d109ce968e673372737a27b09b3cc SHA-1: 17895cf04cde3a53a147ba46276c21f38d0a7321 SHA-256: 997a4add11eb4143825359eb9c767169c507d3cc4205017edab4135407a91bf7
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though partially obfuscated, contains text related to research proposals and includes numerous external URLs, many of which are hosted on disposable domains or link farms. These URLs likely serve as lures for phishing or to download further malicious content, aligning with the characteristics of a phishing attack delivered via a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=que+es+una+propuesta+de+investigacion+segun+autores PDF link annotation
    • http://faxusupovetek.sportsontheweb.net/71366008909.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/HgiJhg0/50672872369.pdfIn PDF document text
    • http://richteam.site/how_to_reset_motorola_xpr_7550ext7ay.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/how_do_i_reset_my_rinnai_heater.pdfIn PDF document text
    • https://cdn.sqhk.co/ninubisidire/jqgihaH/55547241894.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/P7agfYc/managing_oneself_harvard_business_review_classics.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/sheet_street_baby_towelshtee0.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/gdgdiaq/beginner_ice_hockey_leagues_near_me.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/68763066375.pdfIn PDF document text
    • http://timinome.getenjoyment.net/jomon.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/dell_optiplex_3020_wont_power_on.pdfIn PDF document text
    • http://bukapim.mywebcommunity.org/13346161636.pdfIn PDF document text
    • http://rat-red.space/fepopalibufuboxawategdmyo.pdfIn PDF document text
    • http://futup.ru/28160562655wgzjy.pdfIn PDF document text
    • http://spain50off.info/guideline_thalassemia_thailand4z4cs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gupizamowakop.myartsonline.com/57096424592.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 5332 bytes
SHA-256: 32ad12e5b8c6f6e05c8e16eacedaeda96a8160b23f4749e3632b5b92065f5330
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 11572 bytes
SHA-256: 8d042b3c85ee14ff04379f084868857159dca1914ad423d312d0a9d56ef70c36

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