Malicious PDF — malware analysis report

Static analysis result for SHA-256 f519ded59e35d119…

MALICIOUS

PDF

89.5 KB Created: 2021-03-17 08:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bfb92ad08c2947f5842ef3c2323aa95a SHA-1: 2ebc6c06ea394b92b617a9ec4f5b10a3fb0daebe SHA-256: f519ded59e35d119cfe5795e92ed2cd9796634dfcd3d6ecb2754943af14e106d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary technique being the use of embedded links to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/123?utm_term=commonly+confused+and+misused+words+answers PDF link annotation
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/2ddc0da9cc5a489.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/VA8geah/suravafajipawenapovozi.pdfIn PDF document text
    • https://lirisosu.weebly.com/uploads/1/3/1/3/131384099/bbf05f2.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/rDhigez/search_hashtags_on_instagram_stories.pdfIn PDF document text
    • https://vifomamup.weebly.com/uploads/1/3/1/1/131163898/baxuwi_lomamavejola_jigowoweserex.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/6948656.pdfIn PDF document text
    • https://lewibodozibepa.weebly.com/uploads/1/3/3/9/133997785/2253738.pdfIn PDF document text
    • http://vuwubuwo.22web.org/how_to_open_a_maytag_bravos_quiet_series_300_washer.pdfIn PDF document text
    • http://rexexepunefa.22web.org/plataforma_arduino_o_que.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/diaiaib/mimpi_ular_sawa_kuning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_00064623ff5f4334a8693a7e6f6ff52f.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_baa54036213342be86093fcd210f74cd.pdf?index=trueIn PDF document text
    • http://xuvemotoguno.epizy.com/how_bad_is_human_trafficking_in_florida.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/9998353013.pdfIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_3ea66a2507b9481583f9f97d51805f1b.pdf?index=trueIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_69be3e89b290486dab385f1878346356.pdf?index=trueIn PDF document text
    • http://bukinajomo.epizy.com/76427747082.pdfIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_4d4909f7e0b944908d4072037ab3b956.pdf?index=trueIn PDF document text
    • http://lojaxafolato.epizy.com/13675612894.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/61065858489.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/46857147377.pdfIn PDF document text
    • http://daxukutotexodu.rf.gd/98259592860.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_off00012124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 5264 bytes
SHA-256: 7ffd76c35d4b175df2ae46d4574e605c9b3ca88e4a31d9155501c0df567ba190
font_01_sfnt_off00013312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13312 10956 bytes
SHA-256: 8badb8a9ab71db2220bef7609e0d5fbdf17fb83ca04138c1e414487db98cb0ba

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