Malicious PDF — malware analysis report

Static analysis result for SHA-256 156c0771597c9d85…

MALICIOUS

PDF

70.0 KB Created: 2020-11-13 14:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: dfb5e4522923f276a5194fd917248b3f SHA-1: b683279f8058b6e997f4740f7fb31ff7ce9c17f3 SHA-256: 156c0771597c9d8563bdad16af47b6ccd49a3254f0d84e78f7eb1eba6020c2cc
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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. The embedded URL, 'https://trafffe.ru/strik?utm_term=cv+for+phd+application+pdf', strongly suggests a phishing attempt disguised as a job application document. No scripts were extracted, but the presence of an external URI points to a likely attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/strik?utm_term=cv+for+phd+application+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389571/normal_5f9494c949eb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5fa404eaf3bb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5f9e03d55c44d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5fa30d0507508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f89e3556ddea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386829/normal_5f99493f1e3be.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/zugutixe/pogufedogeviboletefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2cdbf66-e5a7-4edb-ad3b-26793330aab1/rativetijexotaruj.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/hindustan_unilever_products_price_list_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/450c8608-98d9-4153-83cf-4eef126968b1/michael_mell_x_reader_tumblr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72081881-62b0-40dc-b967-c74c60d48d65/twilight_jane_volturi_actor.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/beguiler_spell_list.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_off0000c992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC992 4820 bytes
SHA-256: 898027030b7c7b075c54a910a5cbbb07d0732fb5086c3c475d296a8496331663
font_01_sfnt_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 10432 bytes
SHA-256: 870aeeb2d3c9100168d45f90ebb7ee2de8433f69f0ed8e963df870fd7b74c1ca
font_02_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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