Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba7a4e860d62b51…

MALICIOUS

PDF

76.0 KB Created: 2021-03-03 07:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 90a41c5584741205a5e5a233a9a09144 SHA-1: 25aeefc902da4a0f6fb519d4d6a69027fa5d147c SHA-256: 9ba7a4e860d62b511edf1a41a39713c22aa63a96cec8158dcbd0fa33d9e5a086
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to redirectors and SEO-optimized PDF files, indicating a link farm designed to drive traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these external sites. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=plantronics+cs510+compatibility PDF link annotation
    • https://cdn.sqhk.co/pubamegumox/fe4Ejff/electronic_power_supply_store_near_me.pdfIn PDF document text
    • https://womovenurobo.weebly.com/uploads/1/3/1/8/131872055/4012911.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/chgkiog/pobrecita_translation_into_english.pdfIn PDF document text
    • https://cdn.sqhk.co/zojudaje/wKHNhfJ/english_song_ringtone_mp3_download_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/jb3BgiD/mugowubi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5fe3d72d79f7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491157/normal_5fe938dd0bc33.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/XyggR8m/78394848690.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/aidjhik/coin_farming_tsum.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/Ojchchg/rope_hero_frog_ninja_game_download_apk.pdfIn PDF document text
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/padozenegeju.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/v0hji9k/bird_of_paradise_plant_indoor_care.pdfIn PDF document text
    • https://tonawonigavima.weebly.com/uploads/1/3/5/3/135345065/wutilunimeten.pdfIn PDF document text
    • https://cdn.sqhk.co/nimotixalulo/0idcigd/visefagazubaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449771/normal_5fe7dc939db64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5fded9ad3fb3f.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/gdjbheD/lutuvusu.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/fcmjfij/sadodotexixowax.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/iimYiib/justin_bieber_song_friends_lyrics.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/bezegoluzose/fotuvojizovabisufedufisi.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/darksiders_3_review_gameinformer.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/illinois_lcpc_study_guide.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_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 5640 bytes
SHA-256: e28d5e4663996746dfc8976fab9f9cf80f9a14c0d608647df549b372bc16eea4
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 11088 bytes
SHA-256: d00cbf88c4cf9d5edeb7bf4021b69b1d71dc5c9d8ff63d87895f23d1d14ae0e8