Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27f89f7f7c6facc…

MALICIOUS

PDF

80.9 KB Created: 2021-03-28 18:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 416d1db4fd81fc03ebc0660d3c40c571 SHA-1: b0f673ce9f848002ae5f7ba31b16ca4707d224e5 SHA-256: a27f89f7f7c6facc94695d798518b29652649d19c31fe7184e71b6ee491ccc65
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://midufefew.ru/wix?keyword=minecraft+vampire+mod+cure
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/divimuwelilopuv_xakitifekigix.pdf
    • https://cdn.sqhk.co/wujozuzewed/79QNhiz/zojezebuzofod.pdf
    • https://cdn.sqhk.co/falugojafat/difjchj/xurubavinugisosulotovoron.pdf
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/8673b3f4d.pdf
    • https://tuniforokot.weebly.com/uploads/1/3/2/6/132682883/12d59d959ca0e.pdf
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/lovuvaded.pdf
    • https://cdn.sqhk.co/lagexodefajo/dOBO5ja/bajrangi_song_dj_kannada.pdf
    • https://cdn.sqhk.co/jivonaxadu/Rjbgfji/90930500347.pdf
    • https://cdn.sqhk.co/xederebat/hd9TQjj/44013226262.pdf
    • https://metaxilam.weebly.com/uploads/1/3/4/7/134723413/popan_kukem.pdf
    • https://cdn.sqhk.co/letijefa/7Viemcb/92233701130.pdf
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/jadadilupusalupitefa.pdf
    • https://gafepidata.weebly.com/uploads/1/3/0/7/130776025/8e1ab7359c1.pdf
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/gimoraronuj-gobud-tijaradatol.pdf
    • https://cdn.sqhk.co/vekuperik/gfjfCvN/sheet_cake_designs_for_bridal_shower.pdf
    • https://vubisurajoguv.weebly.com/uploads/1/3/4/2/134265568/mikitopejilopub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kefodek/cotswold_way_century_2018_race_report.pdf
    • https://s3.amazonaws.com/nitirew/cdl_school_in_spanish_near_me.pdf
    • https://s3.amazonaws.com/tapelu/barbie_cartoon_in_urdu_mp4.pdf
    • https://s3.amazonaws.com/fapaga/how_to_replace_kitchenaid_mixer_speed_control_lever.pdf
    • https://s3.amazonaws.com/lixasifasi/rationalize_the_denominator_and_simplify_worksheet.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/61184623922.pdf
    • https://s3.amazonaws.com/tuxalowafokuvo/irobot_roomba_960_room_mapping.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_off0000ffb4.bin
0b458953d454f3fa2bdb0b89e58a34a93d177a1fae896fe92889b76bc939fc0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 5156 bytes
font_01_sfnt_off00011142.bin
6d4c445cda0f3c8a10f5fa2be7794a3f2d1cff088a8864ba115b72962724cdca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 10864 bytes

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