Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dddf9c1e50380be…

MALICIOUS

PDF

75.8 KB Created: 2021-02-02 12:56:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7e4e94b7364c90b4a2b38cd52a51d4cd SHA-1: 5c7006ed052264ce5da2d2e6e71c53780622ebae SHA-256: 4dddf9c1e50380be2653adb7d710f3e1591a421cfb557e0354225d88ee1c94e3
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/aws?utm_term=career+paths+management+1+pdf PDF link annotation
    • http://0fruits.space/genki_ii_workbook_answers762su.pdfIn PDF document text
    • http://magazinrf.xyz/sujinofefuxudiziripenusinmgzk7.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/7wdhg80/mp3_player_online_download.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/braveheart_theme_taylor_davis_mp3_fri0mly.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/1pFhpx6/twisted_road_review.pdfIn PDF document text
    • https://dapapakutuluj.weebly.com/uploads/1/3/1/3/131384169/fifinopazoxodir-zijovimugazin-digenule.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/bybihgc/rejasojanofiboleg.pdfIn PDF document text
    • http://graatorama.space/93828214136o3hs9.pdfIn PDF document text
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/vipawev-vifomosagap-pavibadozuveded-peneret.pdfIn PDF document text
    • https://cdn.sqhk.co/piwixesiwufo/aMjehcx/trenches_tauren_wells_chords.pdfIn PDF document text
    • https://feveronibamuja.weebly.com/uploads/1/3/5/3/135300243/nunelikuzoworugi.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/9jjie56/dudunaxagozadepalavida.pdfIn PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/3057289.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/gjkjdje/word_sauce_word_connect_puzzle_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kupovite/cjjdSha/ombre_acrylic_nails_coffin_shape.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://mekavebij.epizy.com/bol_bam_video_2018_mp4.pdfIn PDF document text
    • http://gitipezusev.rf.gd/zoforegematudilulazor.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_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 5128 bytes
SHA-256: 20a556b51f6f348b13856df2f5135430d1a1007a1465c6bc8ef5f4c1844924b7
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 10648 bytes
SHA-256: e9a26161ad8f1fb345dd98627d224d630b451765685500cf5076bc416556c7e2
font_02_sfnt_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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