Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f47bd059e34f57…

MALICIOUS

PDF

77.6 KB Created: 2021-03-19 09:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb90f562c06338067dfe90aac6641b3c SHA-1: 7eac789b859dbcbcea48a37e39233c3ac9053b5d SHA-256: 54f47bd059e34f574a6a16a517d68a340faa770261aa76847704a611ac602473
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious redirection or download scheme, likely initiated by embedded PDF JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=matilda+book+first+page
    • http://tuzurew.iblogger.org/susumokaxikexovexutiw.pdf
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/zurarupade-tukolokifi.pdf
    • https://lawuzifelive.weebly.com/uploads/1/3/4/0/134041442/430477.pdf
    • https://kasexesupa.weebly.com/uploads/1/3/1/4/131437862/441432.pdf
    • https://ravikuzisuwu.weebly.com/uploads/1/3/4/4/134470025/suvokewuwarorasasixa.pdf
    • http://sexugaweguko.iblogger.org/letter_of_recommendation_for_law_school_template.pdf
    • https://xujifedivo.weebly.com/uploads/1/3/4/8/134862591/fatukuranarot.pdf
    • http://buzobofojixez.iblogger.org/durolelam.pdf
    • http://nugekurobeju.iblogger.org/wave_jobim_piano_sheet_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://duxiwosozudut.epizy.com/missed_abortion.pdf
    • http://tavuvije.epizy.com/sarapenemanupe.pdf
    • https://s3.amazonaws.com/pizivurapab/chemnitz_dictionary_android.pdf
    • https://s3.amazonaws.com/fowikorejodi/bekadobosuvada.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/janaboxatekonex.pdf
    • http://zubeleboju.epizy.com/long_legged_fly_bugguide.pdf
    • http://tazumigaxizezov.epizy.com/when_to_use_negative_binomial_instead_of_poisson.pdf
    • http://zogemidagubaro.epizy.com/how_to_choose_a_business_domain_name.pdf
    • https://s3.amazonaws.com/lefemijip/blister_forming_on_mosquito_bite.pdf
    • http://gogibesu.rf.gd/7500585182.pdf
    • https://s3.amazonaws.com/muvevanepen/banner_life_insurance_eft_form.pdf
    • https://s3.amazonaws.com/wizakokowe/latest_bollywood_box_office_report_koimoi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe8.bin
4e573e4840dc399a889e4a9f5e623143015da5fd84067d8274e04b6cf0fb793b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 5420 bytes
font_01_sfnt_off0001026e.bin
2962433ceea71bab4a03ab7a04dda83291a097940354f0582926400483cd9985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 11452 bytes

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