Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fe00b91f143442…

MALICIOUS

PDF

78.7 KB Created: 2021-03-30 16:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5ab3ce2c2cf91f1863851667a6ec8a3 SHA-1: 9aa2be9ec51361bd32756a9a0796fe22fff141a6 SHA-256: a5fe00b91f1434429f0f24bdb3ba684be579ffd34d0a7b2cd9671ee77cb362d0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs point to various PDF files hosted on different domains, suggesting an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=ayurveda+cooking+pdf
    • https://cdn-cms.f-static.net/uploads/4387420/normal_601abc573af1d.pdf
    • http://prodson.fun/duperegupupokodatevoxus0x4q.pdf
    • https://fofosefekilom.weebly.com/uploads/1/3/0/8/130813764/8385987.pdf
    • https://static.s123-cdn-static.com/uploads/4409113/normal_5fef7ad75223d.pdf
    • https://cdn.sqhk.co/vemosoveveb/LgeS8BT/7050749575.pdf
    • https://static.s123-cdn-static.com/uploads/4368989/normal_5fdeee71ab067.pdf
    • https://lozofatogil.weebly.com/uploads/1/3/0/7/130739213/7510954.pdf
    • https://cdn.sqhk.co/napumefu/iiomEfq/zombie_cubes_free_pc.pdf
    • https://cdn.sqhk.co/lolajelor/hhgDXia/qs_world_university_rankings_by_subject_medicine.pdf
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/d89ae1b24c27d.pdf
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/2370329.pdf
    • https://fuzefiwojagolo.weebly.com/uploads/1/3/5/3/135308179/fugelixob.pdf
    • http://pusikoxelumide.iblogger.org/the_eumenides.pdf
    • https://fevokixesebu.weebly.com/uploads/1/3/0/7/130776230/xowinuj.pdf
    • https://zowemuxojawoput.weebly.com/uploads/1/3/4/3/134357794/gevazaragabezusud.pdf
    • http://nukowivoxom.iblogger.org/xiwixadofezi.pdf
    • http://changepass.online/zavitadg1q5c.pdf
    • http://gomunawuwox.22web.org/anoplocephala_spp.pdf
    • https://cdn-cms.f-static.net/uploads/4476152/normal_6016dfa03801a.pdf
    • https://bodupakodekafas.weebly.com/uploads/1/3/2/6/132680796/rafav.pdf
    • http://koolmaxt.online/android_tv_box_compatible_to_nvidia_shieldchdua.pdf
    • http://biweekamnf.com/rbse_class_12_biology_book_download_in_hindigfl9o.pdf
    • https://xuwudavalibabiv.weebly.com/uploads/1/3/4/3/134321130/xubatovanereluduz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kepiguxolirifod.rf.gd/reaccion_acneiforme_tratamiento.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_off0000f63b.bin
8b23eb5a27a8668eb8ca9edc05cac910988cae1d61f52520217da4a7781af6e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 5328 bytes
font_01_sfnt_off00010889.bin
6022424c1f5adfe41f9e7a62b347c30cf870e4687add3432e5668a3c19a3a41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 10908 bytes

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