Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0359e1d5a097f6…

MALICIOUS

PDF

81.3 KB Created: 2021-03-23 00:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: aa09749668009935512f7e03f9d8b652 SHA-1: 9ea5ac0d46b0ef5971d6d77f4d3d663ec4ba70b6 SHA-256: 1d0359e1d5a097f615f0cdbdffbb5ec0b6963d1d6deacf04f2446ef5f35cd182
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The primary external URI, 'https://jacksth.ru/award?keyword=10th+class+math+solution+book+punjab+text+board+pakistan+pdf', is likely intended to attract users searching for educational materials. While no scripts were explicitly extracted, the ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/award?keyword=10th+class+math+solution+book+punjab+text+board+pakistan+pdf PDF link annotation
    • https://cdn.sqhk.co/puxolika/jIQggUC/dumutolebolo.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/ribolupek_banasizi_gosisin.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/abfb7e4a.pdfIn PDF document text
    • http://monogawuw.iblogger.org/3553517194.pdfIn PDF document text
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/4613840.pdfIn PDF document text
    • https://binaxigaxixin.weebly.com/uploads/1/3/4/8/134864800/a87a438c30.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/BQgeghg/51837385092.pdfIn PDF document text
    • https://cdn.sqhk.co/wodegamido/jVhhiji/43444599221.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/zatem-pavunumedikeze-kuxipej-zoburem.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/boruxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/calendario_serie_a_sky.pdfIn PDF document text
    • http://jipiluwokefeke.rf.gd/94442623111.pdfIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_f741dc4dbf1a4caeb4cb46542b5f507c.pdf?index=trueIn PDF document text
    • http://menikax.epizy.com/quran_english_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/scientific_facts_in_the_bible_100_reasons_to_believe.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/2018_attendance_calendar_printable_free.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_e61647c153654901b91b6154291909d8.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 5840 bytes
SHA-256: 40f48308a5c44004ea7b2567c6a6fa9312e3d77137817b1c602c89657183dd43
font_01_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 10432 bytes
SHA-256: 393c632c01001e5e79ff2a883cf2e8d1fffcad1597b512da45a94f36a3881c4f

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