Malicious PDF — malware analysis report

Static analysis result for SHA-256 55548e3af6ed3e6c…

MALICIOUS

PDF

92.4 KB Created: 2021-03-17 19:37:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ba5e4e5e4db43f00894a84872439b0b SHA-1: dcc0c0f88bcaf43f20a124c66eee80a5227f5fdb SHA-256: 55548e3af6ed3e6c8823fcf66282a6f0926b601a1f62d65832d64f42c6d02879
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or to redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to drive traffic to potentially malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/wix?keyword=is+gatorade+a+homogeneous+or+heterogeneous+mixture
    • https://bevikutemo.weebly.com/uploads/1/3/4/6/134648684/pejadub.pdf
    • https://cdn.sqhk.co/fuludasowipu/BigS3hc/45593548387.pdf
    • https://cdn.sqhk.co/texojijoraso/jahiu6W/super_hero_tycoon_roblox_wiki.pdf
    • https://kapiromus.weebly.com/uploads/1/3/5/3/135345701/d73ec633.pdf
    • https://bopugokux.weebly.com/uploads/1/3/4/9/134901566/miwosijol_pupag_xarewopekokoxe_donojenozoga.pdf
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/rugebarula.pdf
    • https://cdn.sqhk.co/luxanimev/dh2MhcB/pugobamarazomumutatu.pdf
    • https://sebupemisopuba.weebly.com/uploads/1/3/4/7/134706320/7876629.pdf
    • https://laxatutokowo.weebly.com/uploads/1/3/5/3/135387201/pekologati.pdf
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/zonowedudi.pdf
    • https://cdn.sqhk.co/tijovomiv/igKMOii/tosefoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zumewozuzetarun.epizy.com/rulawabikozifok.pdf
    • https://s3.amazonaws.com/kudufigunabi/who_makes_snapper_pro_mowers.pdf
    • https://s3.amazonaws.com/safago/math_color_worksheets_1st_grade.pdf
    • https://s3.amazonaws.com/fosagobomap/free_guided_meditation_like_headspace.pdf
    • https://s3.amazonaws.com/tobojelusiwi/53594669397.pdf
    • https://s3.amazonaws.com/fazujo/bein_sports_live_streaming_android.pdf
    • http://genojamezuti.rf.gd/virifozolurutotidinugot.pdf
    • https://s3.amazonaws.com/fusidejebi/78762950624.pdf
    • https://s3.amazonaws.com/bexolamabad/colombia_travel_guide_lonely_planet.pdf
    • http://pitikepaz.epizy.com/family_feud_game_at_home.pdf
    • https://s3.amazonaws.com/mixanaz/busabakevux.pdf
    • https://s3.amazonaws.com/vuxalirudidel/pumuxaroganopikob.pdf
    • https://s3.amazonaws.com/wujodibu/aix_nim_filesets.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_off00012b4f.bin
3822002d578561b08331249ec74311eeac6b42d2a00447ab42329e6159bce0f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4F 5212 bytes
font_01_sfnt_off00013ce3.bin
16de4e054ed8c51d4d9199e4c6100365f5c29ebe449ac63fd8231f105b4a5239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE3 11364 bytes

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