Malicious PDF — malware analysis report

Static analysis result for SHA-256 d333d86ac9b8355a…

MALICIOUS

PDF

72.6 KB Created: 2021-02-13 01:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6e6d60261f43cabbf538e9b450725e07 SHA-1: e326ac2a35720c573eb50f286b590d988bbb127f SHA-256: d333d86ac9b8355a65923fff1d5877bd41c3d3be6cacc084574e9c0a8841fbb9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous external URLs, many hosted on disposable domains and utilizing UTM parameters, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure disguised as an educational worksheet, aiming to trick users into visiting these 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://seumenha.ru/123?utm_term=subject+and+object+pronouns+worksheet+for+grade+3 PDF link annotation
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/setiro_lurujasokofud_zofuwotol_binegarorefulom.pdfIn PDF document text
    • http://gagafelame.22web.org/anti_corruption_commission_maldives_job_application_form.pdfIn PDF document text
    • http://mnatural.space/91082745654wf2rx.pdfIn PDF document text
    • https://ruwuzeget.weebly.com/uploads/1/3/4/7/134755445/7827240.pdfIn PDF document text
    • http://ultra0.space/separation_process_engineering_4th_ejcms4.pdfIn PDF document text
    • http://edapog.online/60278090868652ut.pdfIn PDF document text
    • http://present-mag.ru/584859759485sma2.pdfIn PDF document text
    • http://ratebekanolaja.22web.org/maturawivopisanavevefoz.pdfIn PDF document text
    • https://gosidobesek.weebly.com/uploads/1/3/4/0/134017516/ripinubanitajab.pdfIn PDF document text
    • http://genusadnlo.space/dr_dre_albums_downloadyocdu.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://fofifalog.rf.gd/date_sheet_of_icc_world_cup_2019.pdfIn PDF document text
    • http://zovitox.epizy.com/stereo_isomerism_in_coordination_compounds.pdfIn PDF document text
    • http://ruxurosagogaru.epizy.com/angry_birds_free_for_ipad_1.pdfIn PDF document text
    • http://zazisuj.epizy.com/47549912085.pdfIn PDF document text
    • http://binaxasomeroxat.epizy.com/epilepsy_triggers.pdfIn PDF document text
    • http://feloxokarapuj.rf.gd/jojonilaxubaza.pdfIn PDF document text
    • http://fasokefukolu.epizy.com/rukame.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_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 5860 bytes
SHA-256: d684982e5ee0afda39c04d0fe24b05e6423c14fc5b5925676a3acbbc5ad8db50
font_01_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 10080 bytes
SHA-256: 4122b08035d0ef60fdb96fb2d6b0150d88938e1f7a5af2d0bcd95ef90fadf2c5
font_02_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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