Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6240516131ee78…

MALICIOUS

PDF

77.1 KB Created: 2021-02-05 16:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c475c3c235579c841bf262988e4e31f3 SHA-1: cbbbdca418d121cad1c5409e844b11229f0215c0 SHA-256: 6c6240516131ee783fae2fdc7e056e698c195732c10c6d361cfada53ca1cc0c3
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector domains, indicating a link farm designed for malicious purposes. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Internet manager registration serial number', aligning with a lure for potentially fraudulent registration or software activation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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.
  • 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/aws?utm_term=internet++manager+registration+serial+number In PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/shcZI1G/2nd_grade_math_word_problems.pdfIn PDF document text
    • https://rezigetofetima.weebly.com/uploads/1/3/1/1/131163738/6f7470435.pdfIn PDF document text
    • http://memaviwebepa.22web.org/axure_rp_8_for_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuravaxoxi/ggjDgi0/29289570472.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/jgLiijc/alien_swarm_reactive_drop_parasite.pdfIn PDF document text
    • https://cdn.sqhk.co/mulepava/riegjjh/best_photo_sparkle_effect_app.pdfIn PDF document text
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/nepaxax-nugodet-parejobet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5fc92694e0b7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_5fe772efb2f06.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/iBax7gj/dragon_ball_z_mod_apk_android.pdfIn PDF document text
    • https://cdn.sqhk.co/rokabumake/YG0jcif/holy_roman_empire_historical_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_5fdc071b6d171.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/fzifgge/26444203987.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/U7hjhjc/1819298464.pdfIn PDF document text
    • https://norasavunoga.weebly.com/uploads/1/3/0/8/130874384/sozufewubog-zulefuteza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428039/normal_5ff3f0e763a61.pdfIn PDF document text
    • http://torevifij.iblogger.org/printable_math_facts_worksheets_3rd_grade.pdfIn PDF document text
    • 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://zezajezo.epizy.com/motorsport_migos_nicki_minaj_cardi_b.pdfIn PDF document text
    • http://xenemusexo.epizy.com/xowixexudowag.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/94286226635.pdfIn PDF document text
    • http://rimuvuvipimube.epizy.com/my_talking_angela_videos.pdfIn PDF document text
    • http://ritikaju.epizy.com/nowirefe.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_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 4964 bytes
SHA-256: dc25514ecea69271b7087619e51e2df0547efef502c4fbd2de3648e303e53b2e
font_01_sfnt_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 10256 bytes
SHA-256: e05d1414c1ae52d878260f8acb051ba1c4891b6c4e208c73c0b1afe84e4550d0
font_02_sfnt_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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