Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7c8b8c3e114f84…

MALICIOUS

PDF

84.9 KB Created: 2021-03-02 21:34:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b8a080ab84ffbf50ee2896d2f17a9030 SHA-1: e87d72a61b99087e835f17a82316cdac43acbccd SHA-256: 7a7c8b8c3e114f8422eeb49e7126df92d5004a65415a9c58c17cb958b9c8be4b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate effort to create a deceptive link structure. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a phishing trojan strongly suggest an intent to deliver malicious content or phish for credentials.

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://soxebez.ru/123?utm_term=first+aid+2018+vs+2019+reddit PDF link annotation
    • https://timodidub.weebly.com/uploads/1/3/1/3/131379596/guvavenu.pdfIn PDF document text
    • http://noxiliko.iblogger.org/does_walmart_have_trailer_tires.pdfIn PDF document text
    • https://vujafufitagizej.weebly.com/uploads/1/3/2/6/132696128/supolibuwijuruwes.pdfIn PDF document text
    • https://lavovozanu.weebly.com/uploads/1/3/0/7/130739022/bobijatodisul.pdfIn PDF document text
    • http://bluebadge-support.com/manual_en_espaol_de_handy_baofeng_uv-5rxr2qn.pdfIn PDF document text
    • http://canonsburglake.org/asus_my_library_appx09lf.pdfIn PDF document text
    • https://tagenomamoz.weebly.com/uploads/1/3/4/4/134476715/981c53ab3e1ac1.pdfIn PDF document text
    • http://vevujegijozu.iblogger.org/zebra_setup_utility.pdfIn PDF document text
    • http://copyright-notice-ig.com/chiari_malformation_mri_sequencesq0spq.pdfIn PDF document text
    • http://zizowifajazabor.22web.org/42657420945.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
    • http://wokixewo.epizy.com/sikesemozobomutir.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/fundamentals_of_economics_mcqs.pdfIn PDF document text
    • http://donixug.epizy.com/60478522288.pdfIn PDF document text
    • http://bajaxugezozego.rf.gd/3rd_grade_math_practice_sheet.pdfIn PDF document text
    • http://rupokabimizoju.rf.gd/59677515473.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/kedov.pdfIn PDF document text
    • http://faxajipemafeb.epizy.com/bisanikupozir.pdfIn PDF document text
    • http://zumoriko.epizy.com/42361047056.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 5108 bytes
SHA-256: 2bc0e0e0161d6e385eb5128e25fc0f66c339d571edde4305d93bfd100a4f0fbb
font_01_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 5052 bytes
SHA-256: a83cd00075a05c8f1d029f14e6c220903d5f229d46b2d0464ee1ed4c3ce54e17
font_02_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 11596 bytes
SHA-256: 038503b47efa756144e8618903e41f0b2d2f18ea2a812daf79b7d1c89a6e27b2
font_03_sfnt_off000137b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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