Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b04383f38193b1…

MALICIOUS

PDF

67.4 KB Created: 2021-01-31 06:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 87c714b4b2665bd32239233a9cd830d8 SHA-1: 2f80f431e884b53b57e2be09c5c9cd92e8c8e055 SHA-256: 23b04383f38193b1729e7c72a2b33411f5dbf692b473e22f192ef31894b95d75
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to link farms and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'CLAMAV_DETECTION' heuristics. The embedded URLs suggest an attempt to redirect users to phishing or malware distribution sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/wb?keyword=candy%20crush%20friends%20saga%20mod%20apk%20for%20pc PDF link annotation
    • https://cdn.sqhk.co/vujagefamig/2pnWjLw/word_for_a_master_plan.pdfIn PDF document text
    • https://gapidegit.weebly.com/uploads/1/3/1/3/131379699/zifagibebut.pdfIn PDF document text
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/212133.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/bPig8ih/72279632614.pdfIn PDF document text
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/fenaba-munemelejojoku.pdfIn PDF document text
    • https://kefuvarunif.weebly.com/uploads/1/3/0/7/130739830/vivatitowamefinu.pdfIn PDF document text
    • https://cdn.sqhk.co/tozimozeka/ig0lngc/tigolobaboru.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/fChbgee/blocky_traffic_racer_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/BdieDhc/praise_and_worship_songs_lyrics_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/9iajagg/new_ant_war_movie_download_in_tamil.pdfIn PDF document text
    • https://visimekariluvog.weebly.com/uploads/1/3/1/4/131483525/7dd6de529c57.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisoritet/iogcBbX/stamford_bridge_wallpaper_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/fijufupuga/1hhia5A/door_kickers_mod_apk_revdl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pezofut/wallpapers_baymax_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/chrono_trigger_android_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/gugopamuj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA62 5608 bytes
SHA-256: 87a8a3dafdccb98335b5a5ff96ec903c962ff498480a5fe51bffb5cd0dac538c
font_01_sfnt_off0000dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 10456 bytes
SHA-256: 538b1dba6e5ef891fcabcc210fcc72945d52c4ed438f460ab7cbd2c3161b1871

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