Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd40db2c0efda21a…

MALICIOUS

PDF

74.1 KB Created: 2021-04-03 18:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ba43e7b58b4f5666b5113083e207bc86 SHA-1: b0389c889dfaf276a1be3adfac38a119a87f4663 SHA-256: dd40db2c0efda21a1cef7682158f7e2be7de7e3ccf4ec91c775ca73056ff8ba5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9999

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://zajinet.ru/award?keyword=ashrae+handbook+hvac+applications+pdf+free+download PDF link annotation
    • http://rijupoxog.22web.org/bipolar_disorder_test.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/datarofapakil/workout_plans_to_lose_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac3eaa5-45aa-49ba-a8b6-33819101430c/its_dead_in_the_water_definition.pdfIn PDF document text
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_675afb0eaca74e2e84044994785fe0c9.pdf?index=trueIn PDF document text
    • http://lajuloverebob.epizy.com/guided_reading_level_of_goosebumps_books.pdfIn PDF document text
    • http://zadizufosa.rf.gd/area_of_triangle_using_sine_worksheet.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_b7a1d40d81fa48d8a0969012494cafbc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/msi_z77a-gd65_gaming_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89703b8e-2d8d-403c-823e-a560f3c47231/29550884209.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_facaab19e50d48efab9aef5ccdd7a3ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/grammar_and_punctuation_worksheets_grade_6.pdfIn PDF document text
    • http://budanizuwuder.epizy.com/bajidupibopokokivuwisif.pdfIn PDF document text
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_eb4d7a92f64443a6aada537426a61ea9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libeganot/dell_inspiron_one_2320_drivers_win7_64_bit.pdfIn PDF document text
    • http://gemosufijubimup.epizy.com/crime_patrol_2019_hd_mp4.pdfIn PDF document text
    • http://gidiletejeke.epizy.com/xebufivutunoxosubareboj.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_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 5588 bytes
SHA-256: 15055b9a56efd934af5f3596ec75e0915b8ffb2d411938a82c4ddf33ce100605
font_01_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 10744 bytes
SHA-256: d54817b72e95207f613041bdd9b10486279bacb75591b522fd33e55088508fc2

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