Malicious PDF — malware analysis report

Static analysis result for SHA-256 892971e87e949764…

MALICIOUS

PDF

69.5 KB Created: 2021-03-25 03:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7ac6608fb090f088e0b89f056496e0fd SHA-1: 901e0a47c6775c3aeadf1c3a4b09df8a8185e2c2 SHA-256: 892971e87e9497642de7c8c85b4b4ba404149a523c20f1d551151f0ff81ed61b
224 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/award?keyword=agricultural+science+textbook+grade+11+pdf In PDF document text
    • https://cdn.sqhk.co/bibunifez/QThizk2/worldremit_airtime_top_up.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/heuiczE/chat_american_curl.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/hjh4TjC/52272943759.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/e4F7QrA/musica_italiana_romantica_nicola_di_bari.pdfIn PDF document text
    • http://5dradio.ru/how_to_measure_for_a_replacement_chainsaw_chainmgw66.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/i8DQtjd/56897120360.pdfIn PDF document text
    • https://cdn.sqhk.co/wupetutigo/AifImFQ/44522551418.pdfIn PDF document text
    • http://duplicwcnj.space/gigofuzubiwilusunojeruxgp7o.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/f12gdjh/poughkeepsie_galleria_zip_code.pdfIn PDF document text
    • http://4gusevshop.space/wisemomafibubanukorifutezhhe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_54fe640abdd746f4a3acd6bb6f92c4b4.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_8cde1b015bdf4078b236323a94535383.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_f9c7ea2954bc4d748e5c8afe4917fb4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/bob_marley_is_this_love_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd44d14-8ef9-4206-a87b-191d49f80abc/the_last_knight_trailer_music.pdfIn macro / runtime command snippet
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_ec0c4e2089ef470ca8cf868e1fe82828.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9987218c-ea87-4054-981c-ecc4db14f1a8/dotidunotune.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/rekalenifeku.pdfIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_af9d97496c594c22b9c28e75086a595e.pdf?index=trueIn 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
    • https://s3.amazonaws.com/lusegokaves/bob_marley_is_In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD092 5636 bytes
SHA-256: fdf7fed229cd635871b230df5f2c74081b8bcf10c31e2ae6eb98597355b7608e
font_01_sfnt_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 10668 bytes
SHA-256: 5380277613b995f1891a2890dcf08d1268e05804e9fa6bdfb12586c82cd1486d