Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bef23cac11445ec…

MALICIOUS

PDF

86.5 KB Created: 2020-12-26 03:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e953cb60dabd804ff47296c24e463afb SHA-1: d81aa452776669c6ec98c9a79b645c459c772388 SHA-256: 1bef23cac11445ec4a862c1f06b92461bd7cfb220001ab3b8bc8789cb40035cd
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffking.ru/aws?utm_term=malformaci%25C3%25B3n+de+la+charnela+occipito-+cervical'. This indicates the document's primary purpose is to lure the user to a potentially malicious site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the redirector link strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffking.ru/aws?utm_term=malformaci%25C3%25B3n+de+la+charnela+occipito-+cervical In PDF document text
    • https://cdn.sqhk.co/balekunu/XRibgiD/craft_legend_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_5f98f7d2a7d48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475738/normal_5fd1bf94cfce2.pdfIn PDF document text
    • https://cdn.sqhk.co/telupiza/RQcvlnE/super_cat_tales_2_all_bells_bats_graveyard.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_5fa438d3ebcc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5fb3534b1a283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5f8fd43c177dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5fb4b081dcd36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479454/normal_5fa80cb2be51f.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/wiwuxot/arbitration_agreement_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/namuzofuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc73c273-f912-4788-a4c0-a45959b91bad/best_teas_study_guide_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/method_validation_protocol_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/ac_market_old_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/neck_isometric_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6442c1b-2582-463f-b03f-a936a17a021c/what_is_the_minimum_size_of_a_home_theatre_room.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_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 5452 bytes
SHA-256: cf56f6a827d58ee5f470c882b70f16e9cf22f0e4e976bd1c255693489a6d17e2
font_01_sfnt_off0001247d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247D 11584 bytes
SHA-256: c8f7165d10db1d33008fddf7756cd81fe02a40f5dee447ba2cb704482501e6b9

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