Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35fe84cf263b4c0…

MALICIOUS

PDF

81.8 KB Created: 2021-03-28 16:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 020901d4353e252ae5b241fdfe1f29e5 SHA-1: fdfb94a915a552b6a0be4c5962d9d44541a86416 SHA-256: a35fe84cf263b4c0b46a084deaf15e88338794518b92de9bd4078798c297af14
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a high number of embedded links, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, appears to be a lure for a free Spanish and English dictionary. The presence of numerous unknown and potentially disposable URLs points towards a malicious distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cdn-cms.f-static.net/uploads/4385614/normal_602e71e5bb7fd.pdf
    • http://se-mrush.com/561040979761e8j2.pdf
    • http://tohld.in/dibujos_con_lineas_horizontales_y_verticales_para_colorearcp3t6.pdf
    • https://static.s123-cdn-static.com/uploads/4426087/normal_5ffa392240549.pdf
    • http://gitikirazidapi.medianewsonline.com/46213976539.pdf
    • http://bizifawidipegib.iblogger.org/47367928829.pdf
    • http://sirekijugodo.22web.org/how_to_reset_a_zte_tracfone_flip_phone.pdf
    • http://raduvilisakoxa.22web.org/11738923059.pdf
    • https://cdn-cms.f-static.net/uploads/4484835/normal_6045eadd5d4d2.pdf
    • https://static.s123-cdn-static.com/uploads/4501028/normal_5fe39d4b85588.pdf
    • http://teguruta.medianewsonline.com/calculus_made_easy_by_silvanus_p._thompson.pdf
    • http://amsidgi.xyz/25215923839gh7s3.pdf
    • http://zotoxilob.getenjoyment.net/las_batallas_en_el_desierto_personajes_secundarios.pdf
    • http://nitiwomifigurod.mygamesonline.org/60281613583.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/wb/ENAH/~3/B9wesDdUo4k/wb?keyword=diccionario%20en%20espanol%20y%20ingles%20gratis
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_7bdf890e1a7940c28831020fc0d83c18.pdf?index=true
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_cffca637934b40a491a43926f8a5ba21.pdf?index=true
    • http://somekos.epizy.com/todays_new_yorker_cartoon_explained.pdf
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_30e8d866a1a0419698326df9dfde1482.pdf?index=true
    • http://nozozuwovore.atwebpages.com/88690737637.pdf
    • http://falepafi.epizy.com/what_is_knowledge_self_efficacy_in_education.pdf
    • http://xatofobimuxu.rf.gd/tevewadunogajoxodivi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d3.bin
db3c5678effe266629cbada3d2c6010897d981101be0406cf795102cb93deeb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 5204 bytes
font_01_sfnt_off0000f9a6.bin
e61edfc3efbb1df2011115668991c116e10a50eae338f79cc73ba4b013f78685		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 12528 bytes
font_02_sfnt_off000122af.bin
6ff35bbcdef839a823e086214e5d609f702bf6b4484614f6c4b824d32b7fcc76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16204 bytes

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