Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a57bcb06ca1cc2…

MALICIOUS

PDF

74.8 KB Created: 2021-02-28 23:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 437d91ce522f2f6a80986d550b4838df SHA-1: aa8d7b2500f39d96e081e39ae6106d131fe64e7a SHA-256: b5a57bcb06ca1cc240561334e070e343004a9fb89b749e168eb31fc1ff3c07ac
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily corrupted, contains a keyword suggesting a lure for search engine optimization.

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://golowaki.ru/award?keyword=freightliner+stock+radio+bluetooth+pairing PDF link annotation
    • http://dodemul.mygamesonline.org/sig_p229_e2_discontinued.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/35645015941.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/38220251418.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498834/normal_60047a9862284.pdfIn PDF document text
    • http://scrlt.xyz/m-audio_fast_track_pro_usb_drivers_windows_7iy38t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472768/normal_5fcb4bf19606c.pdfIn PDF document text
    • http://aycotoro7.xyz/2005_chevy_tahoe_service_manualxlhcc.pdfIn PDF document text
    • http://vittorguxx.site/carmageddon_reincarnation_downloadjikky.pdfIn PDF document text
    • http://wavokumad.iblogger.org/new_latest_bollywood_movies_free_2019.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/mesalitekigoguzavisevu.pdfIn PDF document text
    • http://flymoney.net/vezafavoxuvakebosa1b0.pdfIn PDF document text
    • http://jipigebewojafof.22web.org/free_calligraphy_workbook.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/miwifepovoxaratarex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529149/normal_5fc8088b958f2.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/worinifufozivede.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rerununox.rf.gd/ceylon_history.pdfIn PDF document text
    • http://xejonitofopim.epizy.com/bhaktamar_stotra_lyrics_free.pdfIn PDF document text
    • http://nefigubisi.epizy.com/4950505220.pdfIn PDF document text
    • http://dimebuturerab.epizy.com/vugifolapuxadivileza.pdfIn PDF document text
    • http://nibedob.rf.gd/hard_sat_math_questions_practice.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 5492 bytes
SHA-256: 7cfaab740be468d32c5ea8a1ee5660431474cea33613d02c59ab55691b02563a
font_01_sfnt_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 10016 bytes
SHA-256: f10cd755f0a9638ab24b04c9b24173c8691f363ae1be7c0a5a1e6bb87214a5f1

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