Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6e01c0e0acde9b…

MALICIOUS

PDF

122.5 KB Created: 2021-06-05 16:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bed8e3919f01c06d0a5beff6245ccbc SHA-1: 7dd8b59dac97df3249ddd2374729e9132755fbc3 SHA-256: 0a6e01c0e0acde9b29b3b37212980c405ec43f7737cc4998e68fd4d1984a3cea
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to 'https://maypoin.ru/123?utm_term=categorias+gramaticales+formales', which is likely part of a malicious link farm. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0', indicating a phishing or trojanized document. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=categorias+gramaticales+formales
    • https://cdn-cms.f-static.net/uploads/4386605/normal_5fe6d24919131.pdf
    • https://natesikapepik.weebly.com/uploads/1/3/4/7/134750077/1792155.pdf
    • https://favimorujupufu.weebly.com/uploads/1/3/2/7/132710565/ccd148492.pdf
    • https://bewarovawizijus.weebly.com/uploads/1/3/4/4/134454629/572b3.pdf
    • https://mupezoki.weebly.com/uploads/1/3/0/7/130739180/9861343.pdf
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/donenofoxukazar-kurizarok-mapibajawafab-pojuxireki.pdf
    • https://geziduvugizi.weebly.com/uploads/1/3/4/8/134862990/badulebifa-bagulaga-gonivejibetanox-pakab.pdf
    • https://ronawidafaleso.weebly.com/uploads/1/3/4/5/134504313/xomibid.pdf
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/ravoxizi_kifipokanojef_datejogetipaz_zisinefarunu.pdf
    • https://cdn-cms.f-static.net/uploads/4417329/normal_601bb5da05af6.pdf
    • https://papekukikaduli.weebly.com/uploads/1/3/4/3/134361343/6c4e0.pdf
    • https://xokojitijuxup.weebly.com/uploads/1/3/4/3/134362284/1047233.pdf
    • https://sokexuwog.weebly.com/uploads/1/3/4/3/134351495/b2baeabd6eb66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/10087c09-bc89-41dc-a990-76da7cd0e8af/how_to_fix_keyboard_not_working_on_dell_laptop.pdf
    • https://uploads.strikinglycdn.com/files/99e81846-99c9-4085-91a4-c70004b4cd54/amigo_brothers_summary_plus_two_english.pdf
    • http://nitezug.pbworks.com/f/41452204772.pdf
    • https://uploads.strikinglycdn.com/files/3bdf6b14-206f-4cdc-b920-209bfde76eae/20423563009.pdf
    • http://jebusolole.pbworks.com/f/58367595719.pdf
    • https://uploads.strikinglycdn.com/files/457d6af0-2f91-4aa1-a691-dd99dcccc248/movie_screenplays_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/2709ddda-23af-42e7-9d2a-8624fb13d29c/78182111099.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_off000186ff.bin
ec0b724e20e7191cc7513de7c87663b89e960cf3316e75eef9f8990cccf0db6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x186FF 5104 bytes
font_01_sfnt_off00019848.bin
70477d56b8d24d121c0b2dc0ff260e17073127cde40c991603d06c2073f2e93f
pdf-font-stream PDF embedded font (sfnt) at offset 0x19848 13732 bytes
font_02_sfnt_off0001c4ef.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4EF 16204 bytes