Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91ffdfe8897373f…

MALICIOUS

PDF

84.3 KB Created: 2021-03-19 21:10:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 813778eb95d926b0fbd5a87c00fac931 SHA-1: e39d7dd97d9b6fcde829ec26421c70c4db6d9b39 SHA-256: a91ffdfe8897373f2109ba53fb432a757759e8e575e6d88cfb1e6b0dc82e00d9
204 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including a link farm heuristic, suggests an attempt to manipulate search engine results or redirect users to malicious sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with a reference to 'powershell_ise_locks_up_windows_10.pdf' and associated URLs further suggests a potential for executing commands or downloading further payloads, although no specific script was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/award?keyword=carpentry+joinery+paul+n+hasluck+pdf PDF link annotation
    • https://tufakuxumiwe.weebly.com/uploads/1/3/1/4/131454237/zexitelo.pdfIn macro / runtime command snippet
    • https://xinemituvirow.weebly.com/uploads/1/3/4/1/134108685/8126769.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/9249564.pdfIn PDF document text
    • https://solazipakiku.weebly.com/uploads/1/3/4/5/134509697/8277268.pdfIn PDF document text
    • https://dokupikojezox.weebly.com/uploads/1/3/4/7/134740590/3499044.pdfIn PDF document text
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/guvadadune.pdfIn PDF document text
    • https://s3.amazonawsIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/5297645888.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/nsr_music_premnagar_cg_song_wapwon.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/61573041637.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/powershell_ise_locks_up_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/kibulaziveg.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/laron.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/paxuvagal/cetonas_usos_y_aplicaciones.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/synonyms_list_for_third_graders.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/opinion_auditor_general_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/luwupivad.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/36457290691.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/example_annotated_bibliography_apa_6th_edition_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/online_challan_form_fpsc.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/99078902359.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/airline_commander_hack_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/zupusu.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_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 5388 bytes
SHA-256: 649c752c2a27363895963a5146938bf7ce6c2b83fdd4e078d5df8268fd065691
font_01_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 11700 bytes
SHA-256: 385a5ae5b968b791737a8495e06cb1aceb853f01228be86bec8b47950ea99100

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