Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8b55afb150dd0d…

MALICIOUS

PDF

123.0 KB Created: 2021-04-06 22:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3bd96242d2ce524177293ba5411a7a4a SHA-1: 57f8b0cb28d9bbd7e2e1556b2b5e0a297222ce42 SHA-256: dc8b55afb150dd0d64b7afe412dde166034827a5bb77b11c06c92bfd76de0571
156 Risk Score

Malware Insights

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

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 0.9992

Heuristics 5

  • 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.
  • 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/award?keyword=esc+guidelines+acute+coronary+syndrome+pdf PDF link annotation
    • http://delayikapy.xyz/rusty_memory_survival_apk_modac1e1.pdfIn PDF document text
    • https://pufakifitapota.weebly.com/uploads/1/3/4/5/134581323/0e43e76aa488.pdfIn PDF document text
    • http://hhizmet.com/fruit_clinic_game_free_online77wsq.pdfIn PDF document text
    • https://fupebabo.weebly.com/uploads/1/3/4/6/134601971/dedora.pdfIn PDF document text
    • https://kuvukodu.weebly.com/uploads/1/3/1/4/131453249/talita.pdfIn PDF document text
    • https://samivixawudajan.weebly.com/uploads/1/3/4/6/134634686/0a0c60d33e.pdfIn PDF document text
    • https://bitiwinelezom.weebly.com/uploads/1/3/1/8/131856531/xixosimedugiti_setimavogowugen.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/4942244.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/91155342850wsxjk.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/xawegazalaf.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/sasusofude.pdfIn PDF document text
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/4040316.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/wisuw/bangla_new_album_song_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/70815165670.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/jodogojopakasa.pdfIn PDF document text
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_bc5b6deddc0f49329412692df0fd4842.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitok/11th_chemistry_book_volume_2.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/yonder_the_cloud_catcher_chronicles_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/13440465131.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_86e6bd08619c4fcab64f69cd7bdc1172.pdf?index=trueIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_f390260641d3458f8ac89a315eef8972.pdf?index=trueIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_6e5025c187be4e44a68ff9fa006fad23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liluvad/afjet_afyonspor_forma_numaralar.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/lioden_november_event_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/java_swing_tutorial_for_beginners.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E0F 5532 bytes
SHA-256: 52811796c0ee8da45badbf194259f82cd08b2ba4006ff10cab36b9e85e2da8dd
font_01_sfnt_off0001a0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0DB 11980 bytes
SHA-256: b45e2f81ac02f6201086d083054049ce3d94f8be13de1c1d7820b7f3e8f5990c
font_02_sfnt_off0001c88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C88E 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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