Malicious PDF — malware analysis report

Static analysis result for SHA-256 88351e708b286ae9…

MALICIOUS

PDF

73.2 KB Created: 2021-03-23 02:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf496f4162dcf18ac90f580278447495 SHA-1: 1f27a1e4ddfbb4ffa86f59b31fcfaeb52bbd9dae SHA-256: 88351e708b286ae9cb5ba3bc27d22ef7400d0f8854dc4289a268f5e63ff54abb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as part of a link farm. The primary URL, 'https://xezojetit.ru/strik?utm_term=where+is+unity+assets+folder', suggests a phishing or redirection attempt disguised as a search result. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=where+is+unity+assets+folder
    • http://myshoes.moscow/2007_chevy_impala_ltz_for_salerti2p.pdf
    • http://gonisavuxur.iblogger.org/the_time_travelers_wife_movie_explained.pdf
    • http://newuwedeza.mypressonline.com/lalopedujidij.pdf
    • http://fetokisajuxe.22web.org/tasasolopamotuzeba.pdf
    • http://ch-bewertung-2888.xyz/67749130983goi0z.pdf
    • http://nomudepalak.medianewsonline.com/weraxotekilobegapipuzof.pdf
    • https://cdn.sqhk.co/sesijisova/hfhhbif/smash_hit_meaning_in_music.pdf
    • http://javaxirivibewi.mygamesonline.org/43832608887.pdf
    • https://cdn.sqhk.co/rudugebakivo/ee7Fjjj/bouncy_chair_for_classroom.pdf
    • http://pojokup.getenjoyment.net/torogin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_b1a0167b589b485281f81efe5ee56a9d.pdf?index=true
    • http://nuxavezuzoja.epizy.com/credit_limit_increase_template.pdf
    • https://cff07a16-13b2-455b-8a78-148a75b158b4.filesusr.com/ugd/cda0c7_c567f34630d2439e98cc2c54ddf11be2.pdf?index=true
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_260712726a244e4db9e9bf77c87fa64c.pdf?index=true
    • http://kedisijusa.onlinewebshop.net/nesobifigemexezozifej.pdf
    • http://semiwexojexudu.epizy.com/worelat.pdf
    • http://vidugozu.atwebpages.com/83133151500.pdf
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_d317c85bc38b4cf982d76c16cf238120.pdf?index=true
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_3bbfbc2ab9c74fa78f7e4baa525a9c97.pdf?index=true
    • http://latajixow.epizy.com/sony_dav_tz140_price.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_off0000e214.bin
c2b05f753a4dc11306ca444a10cfb245ca005084404810bac5b1f586de2c99d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 5112 bytes
font_01_sfnt_off0000f384.bin
242ed17a953810cb12704ab09511ce870d99045fcf0ebadd7f5ee10a6aae8916		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 10632 bytes

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