Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe4d576fe891034…

MALICIOUS

PDF

68.9 KB Created: 2021-03-30 07:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a755523b4184698f3b2aa65ee40c1a1a SHA-1: 6af1080258b8d9165dca7f622e6bdea6962b1fc0 SHA-256: 9fe4d576fe8910347533e2ccc6a381503dab30fce1bb8eac7d32f6a0083549b6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=bose+ufs-20+ii+manual
    • http://drnextact.xyz/how_to_say_the_hail_mary_prayer_in_latin3j877.pdf
    • http://fesunasisodenod.getenjoyment.net/how_to_make_drum_patterns_in_ableton_live.pdf
    • http://worozoxiw.sportsontheweb.net/tutitetivaraduxezalut.pdf
    • http://lojapidabud.mypressonline.com/gilulenemim.pdf
    • https://cdn.sqhk.co/wazuzofi/jcc4Iia/final_fantasy_crystal_chronicles_ps4_release_date_2020.pdf
    • http://eagleaff.com/boy_scout_wood_carving_merit_badge_worksheetcapvy.pdf
    • https://cdn.sqhk.co/sovajepuxe/ngec2ic/hidden_valley_ranch_secret_sauce_review.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bifovigavij.myartsonline.com/kasexanibofap.pdf
    • http://patudesaruvob.atwebpages.com/autocad_2020_3d_export.pdf
    • https://s3.amazonaws.com/povelenavuviw/emotions_list_for_writing.pdf
    • https://s3.amazonaws.com/pirofopafu/bengal_telugu_movie_songs.pdf
    • https://s3.amazonaws.com/dorobukasawituw/dirt_bike_125cc_yamaha.pdf
    • http://pepiretivixu.epizy.com/absorcion_de_las_vitaminas_liposolubles.pdf
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_25df523bc582439a8ee924af4494d572.pdf?index=true
    • https://s3.amazonaws.com/sulasatevirexo/3118011111.pdf
    • https://89e1056b-8c01-44a4-bea5-a80a497d444f.filesusr.com/ugd/6db6f7_ea282828a2484ee28277688d5b41af06.pdf?index=true
    • https://s3.amazonaws.com/tixedujegibex/5th_grade_vice_president_speech_ideas.pdf
    • http://jizonizop.rf.gd/wanigasigusapokumorajax.pdf
    • https://3c3a732a-bc26-4be5-bc29-345d3dbc3408.filesusr.com/ugd/63a963_bdf70dfe576045ebb3063db39b0dc046.pdf?index=true
    • http://pidejekakej.epizy.com/howard_gardner_theory_of_multiple_intelligences_book.pdf
    • http://rupawozafope.epizy.com/43220928114.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_off0000d012.bin
876036616a1a650b768dc2942740fb150940ae2eb7b2efca97773d2b0c1fae2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 5172 bytes
font_01_sfnt_off0000e1a4.bin
d18d0e695f8f3b9e4dac9b8f5d935ea7769c150c1fbca167faa9031a065d412b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 10620 bytes

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