Malicious PDF — malware analysis report

Static analysis result for SHA-256 a711c5344f40cf47…

MALICIOUS

PDF

77.3 KB Created: 2021-02-20 13:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0987c124832dbac36f4b1dc487115ba8 SHA-1: 455aab59eeb2f03843064299ed9aec6635b1b436 SHA-256: a711c5344f40cf47ea96f82e6fb87cd791c3d78f840e24469ea71e03dff8cb9e
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://yafferge.ru/strik?utm_term=my+suicide+note+love+poems'. The document body, though heavily obfuscated, includes text that appears to be a lure ('My suicide note love poems'). The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern is likely phishing or malware delivery via a malicious link embedded within the document.

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
  • 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://yafferge.ru/strik?utm_term=my+suicide+note+love+poems In PDF document text
    • https://cdn.sqhk.co/mapexovebo/jgxSkDv/word_board_quotes_for_fall.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/wigires2oz9.pdfIn PDF document text
    • http://kulapub.22web.org/63658908951.pdfIn PDF document text
    • http://rafale.store/mujisujoxuzetuzv96x.pdfIn PDF document text
    • http://cactusvpn.live/jegoxixaradabasitapuvop4bvaj.pdfIn PDF document text
    • http://krokoboko6.xyz/convert_to_jpg_free_download_windows_7twbr1.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/ig2igMK/shadow_aggressive_inline_skates.pdfIn PDF document text
    • http://legionmone.xyz/naweguwawimab473te.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_5fe6187b87911.pdfIn PDF document text
    • http://mimasajikataza.iblogger.org/tipuzubuginirafirexoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_601a2d3a1b839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_60246eccbdc4a.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
    • http://gewapapis.epizy.com/phone_tracker_for_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/ambarsariya_video_song_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/hip_hop_dance_video_mp4_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/niluremujajejop.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/dopemoxaziguz.pdfIn PDF document text
    • http://pofazutufugu.epizy.com/access_icloud_drive_ipad.pdfIn PDF document text
    • http://lodibusalibazi.epizy.com/myspanishlab_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/bleacher_report_ncaa_football_predictions_week_2.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_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 4960 bytes
SHA-256: f1f989d0c21bb31f407da09381de957d2c332a29220b924d9bd82a453840f98b
font_01_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 10380 bytes
SHA-256: 3365e12d2056d059efb86083c4f15b3be9fc6a7b60ecf74ba115656c20e0e335
font_02_sfnt_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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