Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fe35b6fd4f4939…

MALICIOUS

PDF

82.3 KB Created: 2021-03-28 09:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9c55d42f724a3222fb431d3b0d6345a3 SHA-1: 98c10ae23b24439136c63ca58f3561fb79d37ac3 SHA-256: 44fe35b6fd4f493956e22d5d3b413cfe241e75a407be0203ac33eb2035ee57d6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=how+many+pages+are+in+the+unwanteds+book+7 PDF link annotation
    • http://vegofejolafud.mygamesonline.org/basic_spoken_english_course.pdfIn PDF document text
    • http://zisesir.22web.org/75972354167.pdfIn PDF document text
    • http://zanetapoxod.22web.org/beyblade_burst_turbo_game_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/gif4ibN/8768600200.pdfIn PDF document text
    • http://masajsalonunuz.com/funomuwupafwcpyq.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/iidgjhH/forge_of_empires_the_king_statue.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/47926572290o6gum.pdfIn PDF document text
    • http://faxagamebajara.mypressonline.com/banting_diet_7_day_meal_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/idgfjhs/69804934304.pdfIn PDF document text
    • http://getbuiss.online/webinomenekgz7ja.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/gpgVLih/mojeguwonobokowomex.pdfIn PDF document text
    • http://gimarokonul.22web.org/busalixokusitudebizaravir.pdfIn PDF document text
    • http://lizuzezusad.medianewsonline.com/anthropology_optional_paper_2020.pdfIn PDF document text
    • http://amorexpo.com/star_words_listmmi95.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/wefadep/jizunawam.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/zopegibuxututiruvetej.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/59111043684.pdfIn PDF document text
    • http://lunufisisosixi.rf.gd/blank_essay_outline_template_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/nugixezazudela.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/cg_song_mith_mith_lage_ringtone.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 5664 bytes
SHA-256: 1a47822679fc9462a898a860779ecf97489a8c64e034f65a5160f42c67fae27d
font_01_sfnt_off00010773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10773 11460 bytes
SHA-256: 698efcd5f35fad79e437fc0b92b91e48aafaeea86aeb130edb34825c0cd6eba8
font_02_sfnt_off00012deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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