Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4c8a1935dd8234…

MALICIOUS

PDF

76.4 KB Created: 2021-03-06 03:33:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3dfb4bd737409b771c1b489ebc44bb29 SHA-1: 7b1f68add0d0dc0da46d61719d5c89fd287e32cc SHA-256: dc4c8a1935dd8234e59a24876b97ac7eaf4455805d9480dcdcb17f980dcaaaa2
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to 'pelibifir.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a resume, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/123?utm_term=how+to+set+time+on+tissot+t+touch+2
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fdcc7d74b324.pdf
    • https://static.s123-cdn-static.com/uploads/4384318/normal_5fc6d6e3e3e5f.pdf
    • https://cdn-cms.f-static.net/uploads/4490140/normal_6035314c672ee.pdf
    • https://cdn-cms.f-static.net/uploads/4417531/normal_6013a2eb22d0c.pdf
    • https://cdn-cms.f-static.net/uploads/4414689/normal_60187a1e032b4.pdf
    • https://cdn-cms.f-static.net/uploads/4409840/normal_5fe6d453ab5e7.pdf
    • https://cdn-cms.f-static.net/uploads/4487432/normal_5fe8e4dd1bab6.pdf
    • http://jujovobima.getenjoyment.net/vowexotimegotilef.pdf
    • https://static.s123-cdn-static.com/uploads/4387218/normal_60020685ceebd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nalifij/sample_resume_for_cognos_report_developer.pdf
    • http://xoxitazowakovit.rf.gd/68299852495.pdf
    • http://mosakokomu.epizy.com/multiples_carroll_diagram_worksheet.pdf
    • http://nonozud.rf.gd/wefozakumejaboxekidowap.pdf
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_f86e668cd64a4a41b587ea22cbf8b17d.pdf?index=true
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_8441cb936d4a466fbb6946cfabc3b6d1.pdf?index=true
    • http://sojizodujibibo.epizy.com/17092486635.pdf
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_6f932a8e17434acba635ea47678bef16.pdf?index=true
    • http://mawuxukajenup.rf.gd/xfinity_x1_remote_codes_for_dvd_player.pdf
    • https://s3.amazonaws.com/tazopaju/16146078499.pdf
    • http://xuxerutiwuv.onlinewebshop.net/92072888128.pdf
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_6b29e7fb22ef4e08a9f2dab714a2b2a9.pdf?index=true
    • https://s3.amazonaws.com/kelageketisefuv/the_secret_history_of_writing_review.pdf
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_55d7134f63854600b3e1c5cb534f70b3.pdf?index=true
    • https://s3.amazonaws.com/wunojipu/template_and_non_template_strand_in_transcription.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb1.bin
970a80d5e8aaac6fb4085111d547d6605d2bda767f7b8ce6816b1d9f8962d326		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 4888 bytes
font_01_sfnt_off0000ff46.bin
8cf3e75afd1b3ba609f58d094dcd09c12e1da4d3cd1f5bb53cbe4fcc8b861296		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 10824 bytes

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