Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b8e855e277405c…

MALICIOUS

PDF

75.8 KB Created: 2021-01-12 00:06:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 002121c35488f41c2cfd31af097d2365 SHA-1: 192c2875ebb000ae655271656d85e5071c19bbc2 SHA-256: b2b8e855e277405cdc5bb0f001a5c0394391cbc73a41c01b402ee826ced66ddb
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits malicious behavior, primarily through its use of a browser extension installation lure. It contains numerous embedded URLs, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/aws?utm_term=android+emulator+browser+based In PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_5fabf66125286.pdfIn PDF document text
    • https://cdn.sqhk.co/nujobuja/RX3TYiz/rapajireparifaluzuma.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/xm6hdhc/tomoloripila.pdfIn PDF document text
    • https://site-1173625.mozfiles.com/files/1173625/pocket_tanks_online_download.pdfIn PDF document text
    • https://site-1173169.mozfiles.com/files/1173169/qksms_pro_apk.pdfIn PDF document text
    • https://site-1172409.mozfiles.com/files/1172409/imsai_arasan_23am_pulikesi_songs.pdfIn PDF document text
    • https://site-1172290.mozfiles.com/files/1172290/download_fast_save_for_instagram_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455914/normal_5fde34b839409.pdfIn PDF document text
    • https://site-1178035.mozfiles.com/files/1178035/space_wars_lego_china.pdfIn PDF document text
    • https://site-1173627.mozfiles.com/files/1173627/social_deal_genieten.pdfIn PDF document text
    • https://site-1172703.mozfiles.com/files/1172703/mci_airport_map_food.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/hciKk1m/81360331584.pdfIn PDF document text
    • https://site-1176876.mozfiles.com/files/1176876/edjing_mix_dj_music_mixer_app_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 3220 bytes
SHA-256: af443ce705348601f68b197baf710081a466f9d95fb60642de925ad7296036e1
font_01_sfnt_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 5192 bytes
SHA-256: b194503124c06b5ef2adae7640cddb8e42ef342e67e20238bd2c02522a8c66c9
font_02_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 14108 bytes
SHA-256: d8a2bdabf2c2afa4eaeaa30d7ea906311322bb5554f122f651ebb765a824aa92

Open this report in the interactive analyzer, or submit your own file for analysis.