Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e42f8185fa38167…

MALICIOUS

PDF

88.4 KB Created: 2021-04-05 23:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 049cafc88bfb3cadabc34a5964b57210 SHA-1: 53a41438076dc6fc2534c12f0036c7756aebb798 SHA-256: 3e42f8185fa38167068cb854c43353603b5ef5bc6132c509d5415d868c8c81de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/wix?keyword=trigonometry+word+problems+worksheets+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419412/normal_60696f07df227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410443/normal_604d3199a701e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5fd1e0fa74412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_600ee7a9a436e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_602c4693d691b.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/91162479630.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5fcaab4723c0e.pdfIn PDF document text
    • http://sarupunojupud.sportsontheweb.net/fitefujegubesixijodafuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_6024f50b32527.pdfIn PDF document text
    • http://doxisodezezaku.iblogger.org/zoxowewoxadonedajovejuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_6059b5d3b6d13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/wuzukap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be7ff47-0d6f-4b3a-acf2-a96253bc9993/what_are_the_modern_literary_theories.pdfIn PDF document text
    • http://nogobixa.epizy.com/what_are_the_best_mods_for_star_wars_galaxy_of_heroes.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/reporter_job_vacancy_in_ethiopia_today.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/justin_bieber_baby_lyrics_video.pdfIn PDF document text
    • http://xinuxupenaze.epizy.com/gupam.pdfIn PDF document text
    • http://bozuzosigakewa.rf.gd/50589779237.pdfIn PDF document text
    • http://manuwakagekewu.onlinewebshop.net/vodakidapanoxiti.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/carson_dellosa_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0057d11d-93cb-4885-b0cc-76ff38ef822b/fixubaxusawigesumoniwa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 5720 bytes
SHA-256: de793ec1444aea40cdf70d971d93d86a3bc003c28dcc2875256e5790a23c3961
font_01_sfnt_off00011671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 11764 bytes
SHA-256: 9687f57a005cba5e5524a2b4fb64f4f5c9a555209f605b44f5e7f700c2516b84
font_02_sfnt_off00013edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDD 16072 bytes
SHA-256: 4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd