Malicious PDF — malware analysis report

Static analysis result for SHA-256 618509ef2399a3a8…

MALICIOUS

PDF

75.9 KB Created: 2021-04-06 23:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 91938e24ef2abdc638dee825c194a2cb SHA-1: 10de2999b1c319a6787723a7a896264818f66824 SHA-256: 618509ef2399a3a884956284bda35d672ff77dd43daebfd4804aa2ea7f5f4a53
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple external URIs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/award?keyword=ejercicios+adverbios+de+frecuencia+1+eso+pdf PDF link annotation
    • https://safopuxe.weebly.com/uploads/1/3/4/8/134893808/mejotonifo_fevivepukadin_xeturepoluvaxu.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/what_are_the_common_properties_of_transition_metals.pdfIn PDF document text
    • https://futuziduxe.weebly.com/uploads/1/3/4/5/134508203/dawojege.pdfIn PDF document text
    • http://wigomufeze.22web.org/82186776594.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/who_is_listed_on_nasdaq.pdfIn PDF document text
    • http://xijivedijimidip.mygamesonline.org/kabalowi.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/4413175.pdfIn PDF document text
    • https://pudagabofozeru.weebly.com/uploads/1/3/4/3/134333597/xukorotaguzen-xajugur-jovoxa-mikozixotobu.pdfIn PDF document text
    • http://boomua.site/34831450108p92tx.pdfIn PDF document text
    • http://kigurumi.org/76721508646vm6hn.pdfIn PDF document text
    • http://mp4.design/how_to_fix_big_blue_party_speakertuyar.pdfIn PDF document text
    • http://autobuff.xyz/how_much_do_dapple_grey_horses_costiuu4i.pdfIn PDF document text
    • http://olivamebel.com/vekikabo1msat.pdfIn PDF document text
    • http://bijepitujutix.sportsontheweb.net/79908624690.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogidisili.rf.gd/tirepizabirix.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/vesavipi.pdfIn PDF document text
    • http://lelikerakovet.atwebpages.com/14951572227.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/nunewujubelalolaxeno.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/fegun.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/lalurivobokonitasixozujef.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/godalozuxizara.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/mtd_2_stroke_snow_blower_spark_plug.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/booth_multiplication_algorithm.pdfIn PDF document text
    • http://mibofive.epizy.com/spell_check_online_free.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_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 5400 bytes
SHA-256: eadfaf63951cd77d9126e91e5facc9804d21e43c9c234143a8c561bc5e5cd930
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 12068 bytes
SHA-256: b8840ee848194723ddfc3514c38e27edfebab2abeaa462fea913644dca3690da

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