Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f47b59b281936da…

MALICIOUS

PDF

70.5 KB Created: 2021-02-21 21:02:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4a8d83eadaf3043a406021737cbc7d3 SHA-1: a92c8b7d0a58d6d87cf5c9c995cf8d61fb1547c3 SHA-256: 6f47b59b281936dac6a1966cccd6ec45031300a198269b77157fac0c5e0288d3
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link to a known malicious redirector infrastructure, yafferge.ru, which is likely used to host or redirect to a phishing or malware payload. The document body, though heavily obfuscated, appears to be a lure related to a product issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=shark+handheld+steam+cleaner+not+working
    • https://cdn.sqhk.co/mudifuto/KsNTmhi/dedopajumaxib.pdf
    • https://cdn.sqhk.co/jizuxadif/2hhjcEz/general_grievous_costume_child.pdf
    • https://wigojakumadofef.weebly.com/uploads/1/3/1/6/131606024/1296064.pdf
    • https://cdn.sqhk.co/xumelesep/jt0gjhd/jabra_sound_app_for_mac.pdf
    • http://world-wild-shop.com/61112196500lakyz.pdf
    • http://storezone.info/13529905253itswt.pdf
    • http://koteyarn.moscow/imagens_da_masha_e_o_urso_para_pintar7o0bx.pdf
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/3126880.pdf
    • http://radanews.site/3432565707m2noi.pdf
    • https://cdn.sqhk.co/sokavuwoz/ijhgvzU/mule_su_android_apk.pdf
    • https://cdn.sqhk.co/rilowikapaz/ijcjghh/27467302727.pdf
    • http://jakartapro.xyz/28154002502agxfb.pdf
    • https://cdn.sqhk.co/goduwonon/hbdicjg/chrono_trigger_upgrade_version_mod_apk.pdf
    • https://cdn.sqhk.co/pigexebobe/GauUhh1/game_video_recorder_app.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kezemiradigu/nexiluje.pdf
    • https://s3.amazonaws.com/padosumifubobo/why_is_the_wireless_light_blinking_on_my_hp_printer.pdf
    • https://s3.amazonaws.com/xamapebonijos/vobesomekifogusowomude.pdf
    • https://s3.amazonaws.com/donarepemi/68535822888.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_off0000d5cb.bin
b566835f794b6179441b6da117d11f402e264784989c2a72d9bfa061396563ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 5612 bytes
font_01_sfnt_off0000e8c2.bin
faac1734cea1bb995fabc44aaccb42addb4e153474327b3ed2eaefae3ced0f56
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 10564 bytes