Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cc304f1cc541d2…

MALICIOUS

PDF

86.0 KB Created: 2021-03-16 16:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d14938a9fb1330c27916dd4f0508d815 SHA-1: 3449dab77520cbe294035b9af01ff760f2f46dea SHA-256: 13cc304f1cc541d2863a79f93062c3c238ea96bbb289b5f85ed41a2b154b8108
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, including a link farm and a suspicious URL, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of multiple suspicious URLs and the PDF structure point towards an attempt to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • 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.
  • 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://botokaw.ru/wix?keyword=taylor+goldblatt+mother
    • https://valisuzikejuxeg.weebly.com/uploads/1/3/4/0/134017117/7082c57e.pdf
    • https://livaruzurakit.weebly.com/uploads/1/3/4/4/134432061/dozabep.pdf
    • http://parazepurafeza.medianewsonline.com/76981249624.pdf
    • http://wedipum.mygamesonline.org/bazolag.pdf
    • http://leledup.mypressonline.com/the_highwaymen_movie_trailer.pdf
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/voniwa_difakovil_latemekex_rubojux.pdf
    • https://taleputara.weebly.com/uploads/1/3/4/3/134305900/2713668.pdf
    • https://babivefe.weebly.com/uploads/1/3/5/3/135312435/684173.pdf
    • http://1fps.ru/664744680781urna.pdf
    • http://tapasin.sportsontheweb.net/fawoviw.pdf
    • http://zogometemo.sportsontheweb.net/how_to_build_a_bridge_out_of_spaghetti.pdf
    • http://com-login8.xyz/excel_2010_bedingte_formatierung_formel_kopierenx61i6.pdf
    • http://theplafond.xyz/fawofekugexazebikelzrsde.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_79f335e5a54147c0b3a4a816c762c444.pdf?index=true
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_3d4454b8a3b6424085cb76f674f1d6a9.pdf?index=true
    • http://rujidafedisezu.atwebpages.com/wamisezij.pdf
    • http://gototura.myartsonline.com/ed_sheeran_-_castle_on_the_hill_letra_en_ingles_y_espaol.pdf
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_d85cd14b7c8a4572b7c4de587298fe5b.pdf?index=true
    • http://rivetibixonapaz.myartsonline.com/english_lesson_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/1c42af4f-c392-4e48-a410-514fa84c4a3e/your_first_year_in_network_marketing_summary.pdf
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_0228f5ba06414c2e865da1b5c8fac5ac.pdf?index=true
    • http://lobopekogolo.onlinewebshop.net/zomim.pdf
    • https://uploads.strikinglycdn.com/files/b5143ba8-43cb-4cae-bd7a-cae17cf0b711/anna_julia_cooper_quotes.pdf
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_3c3898448e38419f8df98771b21d5e04.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1be5673e-102c-444a-ac0c-2ac941004482/92222388936.pdf
    • https://uploads.strikinglycdn.com/files/08e60218-5df9-47af-9fdf-c14dc9007175/niger.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_off0000fc53.bin
92cb6e566f3d316423b3785bba436260e0345504755dee69bb87bb586ceefb83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 5252 bytes
font_01_sfnt_off00010e09.bin
35e0b725e55526c3d418667ca2f9b333c8cc99c35ba48c809a15b88e507b7d7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 11380 bytes
font_02_sfnt_off000134b6.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134B6 16312 bytes

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