Malicious PDF — malware analysis report

Static analysis result for SHA-256 343cde5f8fb233b6…

MALICIOUS

PDF

76.4 KB Created: 2021-02-01 16:12:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4e040e544b7cdf6d3398b74e3b01629 SHA-1: 1021b1e5a5cf44491fca548d96b8108f53ac8ff4 SHA-256: 343cde5f8fb233b625b0a51637e5abdc9bf21351d6c0cb7660f2d10f44dae36a
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a malicious redirector link and a high-confidence ML classification. The embedded URL `https://yafferge.ru/123?utm_term=pph+ps+21+tarif` strongly suggests a phishing attempt, likely to redirect the user to a malicious site. The document body, though heavily obfuscated, contains fragments that align with this phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/123?utm_term=pph+ps+21+tarif
    • https://cdn.sqhk.co/jigavozef/gdjxhj7/my_ufone_app_old_version.pdf
    • https://wupizesave.weebly.com/uploads/1/3/4/5/134581048/paxarajos.pdf
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/tukavorowugusenivudi.pdf
    • https://cdn.sqhk.co/perikowep/hgggeYi/womebefetepugelafilowir.pdf
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/duliwejono-jolinat-jivonusep.pdf
    • https://vexinafofonazes.weebly.com/uploads/1/3/1/8/131871992/4579262.pdf
    • https://cdn.sqhk.co/satofurijob/bijihil/lemonade_stand_ideas_pinterest.pdf
    • https://cdn.sqhk.co/guzowozuk/mbcvggm/tmnt_mutant_madness_character_tier_list.pdf
    • https://cdn.sqhk.co/xaloridinef/jRgjoYu/wd_my_cloud_wdbctl0040hwt_manual.pdf
    • http://formblckr1.xyz/14888438757rv9aa.pdf
    • https://cdn.sqhk.co/durotula/8zOhQKr/42264639233.pdf
    • https://cdn.sqhk.co/girasufu/jicKaJ3/kitoxebidotiririsezozo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://botesuni.epizy.com/silodosiferimaxorab.pdf
    • https://s3.amazonaws.com/kibavutibeved/curriculum_guide_in_english_grade_7_2016.pdf
    • http://gusufarafedi.epizy.com/database_administrator_exam_questions_and_answers.pdf
    • http://veguxakafopuvix.epizy.com/dawexopur.pdf
    • http://junimufik.epizy.com/vbspu_exam_date_2019.pdf
    • https://s3.amazonaws.com/kefiperizonofu/bitdefender_fr_mac.pdf
    • https://s3.amazonaws.com/poguvelefa/teaching_bursary_application_forms_for_2016.pdf
    • https://s3.amazonaws.com/pululusodogi/94763154886.pdf
    • https://s3.amazonaws.com/juduk/bomenudizuwuvugodugum.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_off0000ef85.bin
bc73523ead8db4abe69351f5837053721a266980c1afb846e8029d591043a99a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 5144 bytes
font_01_sfnt_off00010105.bin
0281b5874e94eeba75b3f8a70777f8e51696cba8afff4a6f88399202fe6d6250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 10264 bytes

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