Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6ff768508e567e…

MALICIOUS

PDF

71.1 KB Created: 2021-03-21 08:30:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8a4711050b6f6a968dd45383835b477 SHA-1: 2291a5c5042ae08378a3807eb75d85f9d1d80007 SHA-256: ae6ff768508e567e3a64f142404cd4c2508eac6660a562b9e4fab7266b5047f8
116 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it contains a callback phishing lure, prompting the user to call a phone number for a fabricated issue. An external URI was also identified, which likely serves as a component of the phishing infrastructure.

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/123?utm_term=myanmar+call+forwarding+apk
    • https://static.s123-cdn-static.com/uploads/4365626/normal_5ffd182fd8ef3.pdf
    • https://cdn-cms.f-static.net/uploads/4486221/normal_5fd2d01d5768f.pdf
    • https://cdn-cms.f-static.net/uploads/4469374/normal_601246bd67e27.pdf
    • https://cdn-cms.f-static.net/uploads/4391620/normal_600e4ed479ba9.pdf
    • https://cdn-cms.f-static.net/uploads/4405409/normal_6031fd3458cad.pdf
    • https://cdn-cms.f-static.net/uploads/4380681/normal_60461faf8d1c1.pdf
    • https://cdn-cms.f-static.net/uploads/4387716/normal_6042cf5b39d84.pdf
    • http://boderuj.iblogger.org/cambridge_primary_science_skills_builder_6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lusegokaves/36754442595.pdf
    • https://uploads.strikinglycdn.com/files/0c18ae36-c200-48fb-8f2e-ed7bd2888ce4/can_you_eat_peanut_butter_on_the_mind_diet.pdf
    • http://fuvusujalujule.epizy.com/nelekawiwoxekasatarane.pdf
    • https://s3.amazonaws.com/kagedatabujo/how_to_oil_your_kenmore_sewing_machine.pdf
    • https://uploads.strikinglycdn.com/files/ed85caac-c962-4452-8209-42f885b0fab8/the_little_red_hen_youtube_song.pdf
    • https://s3.amazonaws.com/gavexilatuvitaz/arjun_patiala_movie_all_video_song.pdf
    • https://uploads.strikinglycdn.com/files/e6652a9e-b0d6-4fea-8859-3e99721b9c60/what_is_endosymbiotic_theory_easy_definition.pdf
    • https://s3.amazonaws.com/donukadizolin/asus_rog_crosshair_vi_hero_bios.pdf
    • https://s3.amazonaws.com/libowebujakux/57560441904.pdf
    • https://s3.amazonaws.com/salosibejodod/4150747403.pdf
    • https://s3.amazonaws.com/kewakuko/foruxalevefejewoz.pdf
    • https://uploads.strikinglycdn.com/files/6b67ffa2-6c69-4a66-be69-702d3503e4f3/53373943293.pdf
    • https://uploads.strikinglycdn.com/files/e60a7d1c-1dfa-4cc5-8c10-391c8003f900/dinozarejibanow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccfe.bin
4565b38c79644981f09bc4459a05a2fb9e6aa2a774c92affcf96c0028afc9094		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 5152 bytes
font_01_sfnt_off0000de7c.bin
81a18dd1874297d7de9dd9b44b56e3eff5506368f3194698adaca85fa82ff304		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 10212 bytes
font_02_sfnt_off00010137.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 4324 bytes

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