Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13ed14f822e54b5…

MALICIOUS

PDF

78.6 KB Created: 2021-05-18 16:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 964087d77018827cf18a3e69c177ed73 SHA-1: 7949b7d19577b765f9e01abb388e52f58c54ac8d SHA-256: c13ed14f822e54b53a3e4decf9e5160dfd9670c0c862b3d6fafee506787e34bb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and a remote-support tool lure. The document body, though heavily obfuscated, contains text related to Apex Legends and wkhtmltopdf, suggesting a deceptive lure. The presence of numerous external URIs, including one pointing to `jacksth.ru`, indicates a likely attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/strik?utm_term=how+big+is+the+apex+legends+update+today
    • https://cdn-cms.f-static.net/uploads/4420432/normal_601ece06f116a.pdf
    • https://xamirudanigux.weebly.com/uploads/1/3/0/9/130969419/gojewerasami.pdf
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/bakanifavopazunoxuza.pdf
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5fde70475a8cb.pdf
    • https://kidogotetivi.weebly.com/uploads/1/3/4/3/134375399/sikome-gofodezibaj.pdf
    • https://zuxivojeduzudog.weebly.com/uploads/1/3/1/3/131381782/9554985ba.pdf
    • https://cdn-cms.f-static.net/uploads/4403531/normal_600f25a920552.pdf
    • https://jipunexekamu.weebly.com/uploads/1/3/4/5/134588935/5628844.pdf
    • https://pofogixalozog.weebly.com/uploads/1/3/5/3/135346485/6416014.pdf
    • https://vapovudinawixe.weebly.com/uploads/1/3/1/4/131437980/5380639.pdf
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/wegimutuluju_wuxegupu_numapaxovigosel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lijulijowivaze/cervical_cancer_screening_guidelines_2016_india.pdf
    • http://tudulem.rf.gd/37630374050.pdf
    • https://s3.amazonaws.com/wiwuxot/love_is_a_fallacy_outline_the_text.pdf
    • https://uploads.strikinglycdn.com/files/cd443a89-2e5a-4f31-bf9a-40a37b43e332/midnight_sun_movie_cast.pdf
    • http://pomigipasa.epizy.com/samsung_galaxy_grand_prime_2_release_date.pdf
    • https://s3.amazonaws.com/wikurixobelu/best_hue_and_saturation_settings.pdf
    • http://tijelide.rf.gd/tikuramarumowatife.pdf
    • https://uploads.strikinglycdn.com/files/10a45a37-1226-4516-84a3-e6322480a995/the_awakening_book_2020.pdf
    • https://uploads.strikinglycdn.com/files/e929cc84-41d5-4eb0-9c91-e28b4e6c95d3/lean_canvas_model_steps.pdf
    • http://bogasupi.rf.gd/93710331295.pdf
    • http://faluzarawajuxos.epizy.com/nunugakapapijekukegeko.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_off0000f193.bin
7e36e01131acf26efd577a1e79007d8822d022bff8ca295b9dd9eec355278c8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 5488 bytes
font_01_sfnt_off00010454.bin
c2a8021c5496570d72b02a6238a9dd538f8189984faf4724a3e8a5ec869da46a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 11364 bytes

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