Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea1c927ffb60085…

MALICIOUS

PDF

66.6 KB Created: 2021-01-31 18:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ba5293e214876fdc687bf6584812aaff SHA-1: c3615adb6d11a8d33828e2f7aa8c686e47cbd920 SHA-256: 5ea1c927ffb6008588643f63a148a815a0c7270bcbbbc581746a4ecfed935f11
252 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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.
  • 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.
  • 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
  • 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://crophysi.ru/123?utm_term=rock+and+roll+hoochie+koo+guitar+lesson In PDF document text
    • https://cdn.sqhk.co/netimupoxojo/hjdijjS/war_machines_tank_battle_game.pdfIn PDF document text
    • http://balonedud.iblogger.org/84975771903.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/6377742.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460972/normal_5ff06fb198608.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/Xjggd7K/pacify_farm_update_crack.pdfIn PDF document text
    • https://cdn.sqhk.co/muditazu/ji8N6ie/car_price_calculator_with_trade_in.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5fccaad064e81.pdfIn PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/gizulifiv_xulipofesatur.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/MhgKjhi/scruff_a_luvs_babies_sparkle_series.pdfIn PDF document text
    • http://bofajazikevag.22web.org/free_uc_browser_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dimumaneda/itHnidU/old_arcade_stores.pdfIn PDF document text
    • https://cdn.sqhk.co/dutararopat/gdnhgnw/rio_rex_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_6016c39b5e4aa.pdfIn PDF document text
    • https://cdn.sqhk.co/kesokirow/MiOahgR/12303001455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_601543ab363c3.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/bgd683W/jolajufe.pdfIn PDF document text
    • https://cdn.sqhk.co/dafazizaxav/gePjekR/61747989585.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vutilunero.rf.gd/browser_for_android_2._3_6.pdfIn PDF document text
    • http://deravamosu.rf.gd/bed_size_guide_ikea.pdfIn PDF document text
    • http://borovob.epizy.com/adobe_audition_free_for_windows_7.pdfIn PDF document text
    • http://suzowow.rf.gd/29281222823.pdfIn PDF document text
    • http://potubavaziripek.epizy.com/kikotik.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_off0000c4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A2 5272 bytes
SHA-256: df8e20d61cf042bee432d34b29de421c99dc3f70e14959f74556278b38396906
font_01_sfnt_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 11384 bytes
SHA-256: 85651049e6a84200b15f3fc4eb682b1eb0264f65d6f4326d647e26aca5bfa193

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