Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f38ba8f019c928…

MALICIOUS

PDF

75.0 KB Created: 2021-02-16 21:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 085b5d88003a6b9d5c86d1160455678c SHA-1: c6a08c75b32783765947f5a48d4158c634c331e5 SHA-256: 78f38ba8f019c9286fda5043c5e2acd535e7af279735e97498d33a11b60777c8
170 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://yafferge.ru/strik'. This, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The document body, though heavily obfuscated, contains text suggesting urgency and a call to action, consistent with phishing or malware delivery lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=what+does+the+tree+of+life+mean+in+revelation+22 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_5fd8cfab39b4c.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/iciehbV/free_music_apps_for_iphone_without_ads.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/jepIge9/video_looper_online.pdfIn PDF document text
    • http://bioforcecolumbia.site/28447764191e5jdo.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/pEkgghf/tokaido_crossroads_italiano.pdfIn PDF document text
    • http://moitender.org/character_traits_lesson_grade_1naxs2.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/jammu_university_date_sheet_private_part_2.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/gcQigih/expeditions_zendikar_rising_prices.pdfIn PDF document text
    • http://mon-fortuneo.best/feeling_alone_images_freeo0s5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_5fd175760085d.pdfIn PDF document text
    • http://voxamuzovo.22web.org/98897164470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386829/normal_60074bc2f0149.pdfIn PDF document text
    • http://fixebojamofi.iblogger.org/bodyguard_tv_series_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448719/normal_5ff4c7238f521.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/luropiw/lomen.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/customer_care_service_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/gravity_rush_trophy_guide_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/tokyo_disneyland_food_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/android_tv_remote_apps.pdfIn PDF document text
    • http://zalaxorenisev.epizy.com/cells_and_tissues_word_search_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/55609612488.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/kimirudosanifunupugi.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_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 5352 bytes
SHA-256: cb324cb2587ce295c7ffafde9f18287c73aa17a369b2ffb0bf2d3c762a33ebe4
font_01_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 9984 bytes
SHA-256: a7a75a9fc8884cc305a28e029125898d56b063d7aef5fd0d336f929dbc8a1015

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