Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c32c59b17cc8d7…

MALICIOUS

PDF

75.8 KB Created: 2021-02-11 22:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1b468d895d79bfb397ca117c9b7365a3 SHA-1: b8fdd085f3e858c1ad118ec2b126db517ebc1f00 SHA-256: 99c32c59b17cc8d7fde3e1244a56631bdb90184355ec56fd1d3d0ab012b18491
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'La crosse county wi zoning code', which appears to be a lure to disguise the malicious intent. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=la+crosse+county+wi+zoning+code PDF link annotation
    • https://cdn.sqhk.co/jigugabopu/9cKibgc/wemel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461773/normal_5ff6ab0d78e25.pdfIn PDF document text
    • http://wemexuj.22web.org/moth_lamp_meme_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402520/normal_5fc9edefaf1f5.pdfIn PDF document text
    • http://kijejakedaje.22web.org/latest_movies_hd_hollywood.pdfIn PDF document text
    • http://kneeksi.ru/civilisation_6_starting_guidejwtfa.pdfIn PDF document text
    • http://hookup671.site/kovotozopruivg.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/ieKrhd8/lujenaxujixebowog.pdfIn PDF document text
    • http://joblanc.xyz/acronyms_examples_word_formation8bweu.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/dasunuxozawa.pdfIn PDF document text
    • https://ginuzakonufa.weebly.com/uploads/1/3/2/6/132681862/4103455.pdfIn PDF document text
    • http://aduo5.online/372238610863aou5.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/jcjqsgi/48366037266.pdfIn PDF document text
    • http://maska-respirator.com/duxobigawopipiminet1u.pdfIn PDF document text
    • http://vsspb.ru/zilma_de_oliveira_-_educao_infantil_fundamentos_e_mtodosoe7la.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://tokukemojitiwil.epizy.com/prolactinoma_guidelines_2018.pdfIn PDF document text
    • http://jidabalelibixu.rf.gd/blessed_be_your_name_satb_sheet_music.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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 5144 bytes
SHA-256: 1d800391dc516d5481ade019aec60ee62ce1fc3595af453f4e527dd7ea459a9d
font_01_sfnt_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 14052 bytes
SHA-256: bc407eee01c3bd00107e472d9de673aadc3e86a1bfa4a382eb45e6883da94a26
font_02_sfnt_off000113ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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