Malicious PDF — malware analysis report

Static analysis result for SHA-256 677753ee49d4f3d5…

MALICIOUS

PDF

93.0 KB Created: 2021-02-23 21:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05ef2e5ed4062962dba7a78f480850a2 SHA-1: 4b4c8336bb49dbef6eba714640dfd699698542b9 SHA-256: 677753ee49d4f3d55210944e83c25760bc8b1a4c16aa76d19557842acc12026d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/123?utm_term=the+heirs+bande+annonce+vostfr In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369306/normal_5ff784516a96f.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwutu/eR4Bgci/free_klondike_solitaire_download_for_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476569/normal_5ffc1b7588619.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/dhghagf/video_poker_slot_machines_free_download.pdfIn PDF document text
    • https://dotozirijekuzo.weebly.com/uploads/1/3/4/3/134315872/9033c5b7a17.pdfIn PDF document text
    • https://dubujede.weebly.com/uploads/1/3/4/6/134607356/napuf-tixamoxupev.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/1641086.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450632/normal_5ff8147545f88.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/DjgLgcI/guns_servers_for_minecraft_pe_apk.pdfIn PDF document text
    • https://gediwidamavuluv.weebly.com/uploads/1/3/5/3/135348022/zunokatonunupuf.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
    • https://s3.amazonaws.com/pazovugal/tozasop.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/dizonewigot.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/blender_video_editing_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/98414390469.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/windows_10_game_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/febato.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/desktop_wallpaper_1920x1080_hd.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 15252 bytes
SHA-256: a0830dbb05ef016c003dd5d8cd00533b13ed2365c4bae67dec97d25fb74d812a
font_01_sfnt_off000123c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C2 5012 bytes
SHA-256: 128d642c795b3d44ae82a451aa41623c71fe72881937cdd2c47b31270e0256d8
font_02_sfnt_off000134bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BF 10456 bytes
SHA-256: 7f5ac471900201580b67b25339af99313f5ed02fc0db47f9b860c3cf406dd97e
font_03_sfnt_off00015849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15849 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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