Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa08da739594cce…

MALICIOUS

PDF

83.0 KB Created: 2021-03-02 00:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 842c078b7baaf93e2927b31a7059f577 SHA-1: 7523af62779cb7fca3ad546a9bc3b87ff5676f44 SHA-256: 9aa08da739594cce40e57ffc8ed510d240b2b3cccf15914a34aca9b6c04ae035
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of 'cmd._gotorecord_acdataform.pdf' in the document text hints at potential command execution or exploitation, though no specific script was extracted to confirm this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://jacksth.ru/123?utm_term=will+dispute+lawyers+melbourne PDF link annotation
    • https://buvaranugabenu.weebly.com/uploads/1/3/0/8/130873820/02221f968ffe.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/jhnXEUI/kennedy_fabricating_splendora_tx_77372.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/gdndGid/nutawa.pdfIn PDF document text
    • https://cdn.sqhk.co/ponajadu/hdFgdhe/smash_sword_fighters.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/xjage5j/26837241422.pdfIn PDF document text
    • https://tefakunuti.weebly.com/uploads/1/3/1/8/131871494/6ab37501324c7.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/5jfgcgf/safesijanipevawo.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/fihO8he/crossword_clue_solver_nz.pdfIn PDF document text
    • https://zawoxabupuw.weebly.com/uploads/1/3/5/9/135990747/a076ff816ce27.pdfIn macro / runtime command snippet
    • https://muvitexovab.weebly.com/uploads/1/3/4/6/134639258/6318086.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/nighgFY/free_tracing_numbers_1-_100_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/igtYLRC/39863740816.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/eshcgiW/gunship_iii_us_navy_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pibusupi/ji3BQne/strategy_war_games_pc_ww2.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mixonanax.epizy.com/chemistry_bonding_packet_worksheet_1_answers.pdfIn PDF document text
    • http://magakawigola.epizy.com/docmd._gotorecord_acdataform.pdfIn PDF document text
    • http://wuzuwoxijotefik.epizy.com/tekonsha_prodigy_rf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 5332 bytes
SHA-256: 998eb0ee84081ab3fa2baa88104036650135af056d70b729aa1b37c2ba982683
font_01_sfnt_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 10784 bytes
SHA-256: ef8309837538e01cce4627190549cbc578453fad098da8dde3c1ef68c5011258
font_02_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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