Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bc36427f80a27f…

MALICIOUS

PDF

84.4 KB Created: 2021-04-05 13:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1c6c0130400a1e91035091bd689e8a0 SHA-1: 51f6105759e99f7bdb64c2d1b738a2569bf03cbf SHA-256: a3bc36427f80a27f8dc612ed5af43be643b64791d622a69faf04c0d94ee8be6a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. It contains numerous external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, appears to be related to 'pdffiller free trial', aligning with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/award?keyword=pdffiller+free+trial
    • https://cdn.sqhk.co/potiribuwuf/ji2gcif/top_100_hip_hop_music_2020.pdf
    • http://topcreditcheck.info/sas_ods_rtf_textmspmw.pdf
    • http://onatural.space/xazakapixedun599w.pdf
    • https://cdn.sqhk.co/xedasuzefer/hfNgjie/72757522664.pdf
    • https://cdn.sqhk.co/poxudanefisi/g5id4gh/c_f_full_form_export.pdf
    • https://cdn.sqhk.co/resozasevej/jGaifRR/46771351694.pdf
    • https://cdn.sqhk.co/girolivudafo/7ibiaia/music_notes_painted_on_rocks.pdf
    • http://kprovk.xyz/21630919001evce7.pdf
    • https://cdn.sqhk.co/litigoruf/c7gjn71/countryballs_latinoamerica_memes.pdf
    • https://duvirimak.weebly.com/uploads/1/3/4/6/134603536/53776.pdf
    • http://tacfitproducts.com/when_is_the_season_2_of_one_punch_manwc8xx.pdf
    • https://cdn.sqhk.co/kabevapixox/rhhoifD/dark_hero_viii_release_date.pdf
    • https://cdn.sqhk.co/ridasozewe/aelgjes/word_online_for_free.pdf
    • http://table-wait.com/91821546530tt0zn.pdf
    • https://sujarazigis.weebly.com/uploads/1/3/0/8/130813042/fefazexe.pdf
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/14986.pdf
    • https://cdn.sqhk.co/towitudamuga/gjiaBja/true_football_national_manager_ios.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_a95751a93f134746854aa998cfb4a22c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fff344a0-8b9c-4272-a179-be16c9b57061/gumetebopibuxufomosido.pdf
    • https://uploads.strikinglycdn.com/files/249ae8c5-aa92-44ec-b70d-7d7ff4655e24/libro_de_matematicas_5_grado_contestado_para_maestros_2018.pdf
    • https://uploads.strikinglycdn.com/files/16d9fd8a-98aa-486f-9038-ed72bb2f6726/fovamivopevagovudekunok.pdf
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_3eb148f7859d4553b0aba7ea48ef5748.pdf?index=true
    • https://uploads.strikinglycdn.com/files/861c0212-24ed-4569-af0a-a0da16239c2d/bozafuninimeti.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f722.bin
5c8b32088b441ba05031176dae0c49a90dcd4c9b2f3ab673bad97565eefa3db5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 4724 bytes
font_01_sfnt_off0001073d.bin
8758c669b30494409db851f6fc90f8a092036cb7b0e80a0452a5995bccbd25cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 11116 bytes
font_02_sfnt_off00012d95.bin
c64f975c7c74378765a15e192890ba001b575443647995d4109c17b56814fb1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 16544 bytes

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