Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed57fd1a802fc776…

MALICIOUS

PDF

85.0 KB Created: 2021-03-06 02:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31cc4bb9ee0e6df1005fc9f53b260039 SHA-1: b639de6bb6f1073dec9b74bf93593c2c971dd112 SHA-256: ed57fd1a802fc7766b79c8df8fff9f94b5376fa391c1669211d5f02020055e8e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, redirecting users to various potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to scientific content to mask the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/award?keyword=atoms+form+bonds+with+one+another PDF link annotation
    • http://grizhoff.ru/apod_nasa_gov_19th_july_202099dzk.pdfIn PDF document text
    • http://copyrightshelpscenters.com/coordinate_and_cumulative_adjectives_worksheethy6o4.pdfIn PDF document text
    • http://detonic-shop.website/diablo_3_save_editor_ps4_download160sp.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/lesamikefisumufujs7my1.pdfIn PDF document text
    • http://cashfree.store/764490081272w4dr.pdfIn PDF document text
    • http://andyhong.blog/great_customer_service_letter_templatenfcwy.pdfIn PDF document text
    • http://blognews.top/virtual_xposed_apk_no_root_latest_versionj3ogk.pdfIn PDF document text
    • http://xalisuvo.22web.org/smart_wristband_manual_svenska.pdfIn PDF document text
    • http://tibetterrier.ru/jatosunedofademt2xgo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xapidajovaji/cortex_m3_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4123f3aa-5827-4a63-9a3d-724078a2d119/xogopisawanewapasolomam.pdfIn PDF document text
    • http://dunupilopun.epizy.com/how_soon_can_you_renew_your_georgia_drivers_license.pdfIn PDF document text
    • http://juvejuvikanu.epizy.com/xifasafafafuzun.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/46996766447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e5b3c8-af63-46fa-b2da-3a2f03da51a7/the_secret_book_review_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/girlfriends_guide_to_divorce_finale_explained.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/ego-t_vape_pen_blinking_blue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bc4a75f-9069-47fa-87b4-31002a84406a/what_are_the_essential_characteristics_of_assets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/437e9647-c10e-4fb8-a09b-3fc11779a83c/volabobutuduwirivojeda.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/11760893058.pdfIn PDF document text
    • http://zosubimonoz.rf.gd/nisevepebufipetibovorovuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b59c30e-57e3-4cf4-a65e-d84b064aad5e/80689835579.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 5124 bytes
SHA-256: 39b20d873a8c86eee2048716b3abbbfb10a93a428b0448960d8ed095bd699d56
font_01_sfnt_off000113d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 10648 bytes
SHA-256: 3f91c26fd262bb23fe3a507ce7fa49a5b5f067ac6c5fe37b8579adf444a94ab6
font_02_sfnt_off00013841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13841 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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