Malicious PDF — malware analysis report

Static analysis result for SHA-256 976c767d00ef54e5…

MALICIOUS

PDF

68.8 KB Created: 2021-04-06 21:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 233f2def46f705c81902c70d5cf4d37a SHA-1: 11e855fd8e6ecb663f6dc96a13e87193ff1805bd SHA-256: 976c767d00ef54e5365c7dff073abdef153cc93d451b6427dc5bc84603285ec5
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=biblia+de+estudio+teologico+reina+valera+pdf PDF link annotation
    • https://wafanipo.weebly.com/uploads/1/3/2/6/132695839/3255637.pdfIn PDF document text
    • http://vopezikililurab.mygamesonline.org/44316387059.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/audio_technica_lp120_needle_replacementgyu47.pdfIn PDF document text
    • https://cdn.sqhk.co/lexujowina/ji11uje/minicraft_download_mac.pdfIn PDF document text
    • http://frukt.fun/palobufegorh7wll.pdfIn PDF document text
    • https://zekedijudanafow.weebly.com/uploads/1/3/0/8/130874467/derovikadomisax.pdfIn PDF document text
    • http://idealicaitalia.website/giwovexuzegovuwubap61vk.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/djjieie/5672414831.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/78319101139.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/ib0tDiR/writing_a_bibliography_harvard_format.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/msc_zoology_notes.pdfIn PDF document text
    • http://doucheop.xyz/what_is_carbon-14_dating_technologyg4qg8.pdfIn PDF document text
    • http://italysummer.space/left_hand_of_darkness_character_analysisec4bm.pdfIn PDF document text
    • http://pelistens.xyz/6249661645347bbw.pdfIn PDF document text
    • http://newyearshop.site/sqlplus_commands_in_oracle_11g7zzxc.pdfIn PDF document text
    • http://kelnoteres.xyz/take_and_receive_composerroepf.pdfIn PDF document text
    • https://pukizorot.weebly.com/uploads/1/3/1/3/131384201/5804281.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/d7BCVjf/befanuwozap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widifusi.myartsonline.com/manotisudekabuwojabepilir.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_off0000cb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB87 5572 bytes
SHA-256: b34b68fd39ac72daaeb88ef151ed7f5b21e8538e38a9929f2027b174d559652e
font_01_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 11624 bytes
SHA-256: a72425c36c7f2cf1672cc92c0d7759f3b266b521f730f70c03a0530a400b6aec

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