Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b017b9b7827d1d…

MALICIOUS

PDF

79.8 KB Created: 2021-04-06 12:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a082bfc72eb8db50686da8eb6b9aca47 SHA-1: ae85350536273544280ed951ed4b880439d770aa SHA-256: 43b017b9b7827d1de467ca8546ed775b2ca491875674de9c5dc03df2dd4109c2
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://mezovuduw.ru/123?utm_term=everybody+knows+john+legend+sheet+music PDF link annotation
    • https://cdn.sqhk.co/baxijaxazixi/ZheidAO/81396222050.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/yribQKa/how_to_loot_pin_pull_game_download.pdfIn PDF document text
    • http://nulupupekoxekam.22web.org/craftsman_dys_4500_mower_deck_belt_diagram.pdfIn PDF document text
    • http://sakipewo.22web.org/wexefamoxovatazotaboz.pdfIn PDF document text
    • https://cdn.sqhk.co/kisoxukapab/foghu1H/liboximizojukisipav.pdfIn PDF document text
    • https://cdn.sqhk.co/xenaporo/BQ8ifje/83743612039.pdfIn PDF document text
    • https://cdn.sqhk.co/gawisibiw/0gijejb/91860748523.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
    • https://s3.amazonaws.com/mijumomub/baldur_s_gate_2_mod_apk_revdl.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_cdd789fe07de477fb70aec0640e3f20f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/rani_aldebaran_quest_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/zowegubarekivudim.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/48798678673.pdfIn PDF document text
    • http://nufuwulevek.epizy.com/33061843432.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/police_performance_appraisal_phrases_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/zofidoval.pdfIn PDF document text
    • http://bosirizowu.rf.gd/divojadezezujijupedif.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/tusepotobifanozofo.pdfIn PDF document text
    • http://balukop.rf.gd/50986407936.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_e01498536b8d407a87abedab20fa7f93.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/wamimukizezuto.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/vasovagal_syncope_prevention.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/50094841438.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_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 5516 bytes
SHA-256: c24d64cad4bced727114bdc95e0e82d451eb3e313260df3c069b3eacde938e03
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 11096 bytes
SHA-256: e3ba5bc1bfb9e2a24a70f5a11929f4370568b2619350ce59058ca1532863db26
font_02_sfnt_off0001238d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238D 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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