Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af37c499859c7ca…

MALICIOUS

PDF

74.1 KB Created: 2021-02-21 22:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 02c7901e0cc24a390619feb78995f7ab SHA-1: 29c564183d8800e4a36a68695e4e6e234c13090e SHA-256: 4af37c499859c7caea020006f15ce9ba8134631ea7d166b21e4722dbf191379e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with the primary technique likely being Spearphishing Attachment. The document body is heavily obfuscated and unreadable, but the presence of numerous external URLs suggests a redirection or content-hosting purpose.

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://seumenha.ru/123?utm_term=how+to+lose+weight+at+home+diet+chart PDF link annotation
    • http://tisimewifexumi.iblogger.org/44399900149.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/pjhgeje/andor_s_trail_loader_map.pdfIn PDF document text
    • https://moxigowa.weebly.com/uploads/1/3/0/8/130814106/samukitofewo.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/Vgchdif/k-_pop_band_name_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/hEUjieK/xuzetaxegoxepiroxivoje.pdfIn PDF document text
    • https://gegiritofizupog.weebly.com/uploads/1/3/4/6/134644009/e785a8e17e0247d.pdfIn PDF document text
    • http://romabeveseruzor.22web.org/avoidance_strategy.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwapusumoge/hbpBhev/chicken_manure_compost_tea.pdfIn PDF document text
    • https://tumazalewiguta.weebly.com/uploads/1/3/4/7/134755417/kotubumowinadoleran.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/zepifudoxapo/musical_cue_sheet_l_g.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/nenekazovoxusasos.pdfIn PDF document text
    • http://xurorovesi.epizy.com/64804043507.pdfIn PDF document text
    • http://neponabozez.epizy.com/pdf_to_excel_converter_nitro.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/wasulipurugajoxi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 5408 bytes
SHA-256: d024c2a008c2343c2a7abe696045200693d6b7dc0465a5d321d2c6fb6adf4398
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 10512 bytes
SHA-256: ba5ce026228765918a26866efdb61793e1aaaafeb54cf84873252d6503c0f141

Open this report in the interactive analyzer, or submit your own file for analysis.