Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa39405cc383ab17…

MALICIOUS

PDF

74.0 KB Created: 2021-03-03 09:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4f3c10db4eaf5c750fe98e1d9c08564a SHA-1: b71e7b571c34bb5f813a0027539cef7aa2a279f9 SHA-256: aa39405cc383ab17da50bf8fa6c5d21a01099a89052680c5ec374c51778f109e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or unknown reputation sites, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to financial classification, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/123?utm_term=clasificacion+de+las+cuentas+de+balance+segun+las+nif PDF link annotation
    • http://lifeeuro.info/sajofifagukapajuvowig1uk0p.pdfIn PDF document text
    • https://cdn.sqhk.co/xatuxazaz/jggYiex/fogopedetoxukogak.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/iMKijgj/wawum.pdfIn PDF document text
    • http://srakan.space/les_cercles_de_la_forme_bolivarl9xiv.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/dGajeie/apod._nasa._gov_archive_2003.pdfIn PDF document text
    • http://aarbuz.space/sasonuxavexagasipaxosopaxi219s.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/what_n-type_semiconductor.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/RuNhh6f/pottery_making_gift_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/fezozepefik/ghiczNG/live_nation_national_concert_week_2018.pdfIn PDF document text
    • http://yeswins.space/comptine_d_un_autre_ete_sheetkwn7z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zonivezada/electronic_circuit_analysis_and_design_mcgraw_hill.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/android_8._1_frp_bypass_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/futurama_fry_meme_template.pdfIn PDF document text
    • http://butorinowu.myartsonline.com/husqvarna_128ld_weed_eater_parts_diagram.pdfIn PDF document text
    • http://jeragapa.epizy.com/zibat.pdfIn PDF document text
    • http://muvusibose.rf.gd/45317180819.pdfIn PDF document text
    • http://pakilapawunafep.epizy.com/creative_writing_worksheet_for_grade_4.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_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 5136 bytes
SHA-256: 3c2e2dfae86f39f6e779c80140293932f175ef02680b4f0a786a3318b6bd8dd1
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 10804 bytes
SHA-256: 654db8b98f13a387bdf5dec76781dec64113762c3aaa5eecdb50e8bd480d60cf

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