Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad3cffc4b64807c…

MALICIOUS

PDF

75.2 KB Created: 2021-06-07 16:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e6dd73deb040a07b7b024b750c945001 SHA-1: 337f0f2a7754d3ffdfa85a54a80fdc98604c8ebf SHA-256: 0ad3cffc4b64807cd7a0ab7c5f19c219be6ee131d75edc2b6d75444d45f5721d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a dictionary PDF, which is a common tactic to trick users into clicking malicious links.

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://wastran.ru/pbw?utm_term=concise+oxford+dictionary+of+english+etymology+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384460/normal_60461ed9c0ffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413238/normal_604d1d32515f4.pdfIn PDF document text
    • https://nemoderi.weebly.com/uploads/1/3/2/3/132302766/854f270fe1133.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449777/normal_6002f6c6136b8.pdfIn PDF document text
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/196fcc7ee.pdfIn PDF document text
    • https://vanuludegevu.weebly.com/uploads/1/3/0/7/130776818/moguri.pdfIn PDF document text
    • https://nizomepovunamox.weebly.com/uploads/1/3/4/3/134305669/c0f157b3da1f7.pdfIn PDF document text
    • https://pikotefomulig.weebly.com/uploads/1/3/4/3/134317367/2467629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_60379da855a1e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4474192/normal_60b20a13b81da.pdfIn PDF document text
    • https://bugagage.weebly.com/uploads/1/3/5/3/135330359/pesixovoj.pdfIn PDF document text
    • https://kowabimope.weebly.com/uploads/1/3/4/3/134359524/sinazibituk-sirumenuriwoj-budewikosaxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwolufit.pbworks.com/f/cambridge_igcse_business_studies_fourth_edition_answers_chapter_28.pdfIn PDF document text
    • http://tevimunon.pbworks.com/f/umrechnen_dollar_euro_excel.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/how_to_properly_use_arc_trainer.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/1448114741.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/f/casio_protrek_5113_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae3e129-1401-4d0e-8b14-a865c06399dd/sugalekewukepogigumonix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955556ff-d339-48d0-a359-0b00ad2a6fe8/what_is_lewis_structure_for_co2.pdfIn PDF document text
    • http://sokulus.pbworks.com/f/nutrition_info_6_oz_blackberries.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/f/what_is_iodometric_titration_and_iodimetric_titration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e51c873-1f7b-4c36-9d4a-c211fffd6d35/parkour_race_minecraft.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_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 5644 bytes
SHA-256: 7f7428c4e2132d7921998350a8c072479e7b9760d5417eae4f25f941e79b8660
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 10968 bytes
SHA-256: 351972990cfddac8a6f1d095cf84e5e0af31afc2bc9f11f332403cab539d0e9f

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