Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6e7c17ec657194…

MALICIOUS

PDF

75.3 KB Created: 2021-03-13 18:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 492567134f7f3923e45386a3ec026b21 SHA-1: 177341b480dbfc2a16ad28ea8185d056b3f7795d SHA-256: de6e7c17ec65719477d1db872260cc0fbf0413d1466b0a6d36f0028bdd8f4044
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jumiwimov.ru/award?keyword=ccna+pdf+download PDF link annotation
    • http://dresdenpharma.ru/cognitive_psychology_examples6cbmj.pdfIn PDF document text
    • http://kismykeitio.best/gogefezuwofuxuxufejibinedssw2p.pdfIn PDF document text
    • https://pedigujelod.weebly.com/uploads/1/3/4/0/134096449/4e66f478.pdfIn PDF document text
    • http://nicepics.xyz/770118817409k55w.pdfIn PDF document text
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/8a431875844a19.pdfIn PDF document text
    • http://wativeb.mypressonline.com/jokazuleliv.pdfIn PDF document text
    • http://gudelew.mywebcommunity.org/50043400630.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/what_is_the_best_heater_for_above_ground_pool.pdfIn PDF document text
    • https://kigimijufofudiv.weebly.com/uploads/1/3/5/9/135977026/6407848.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_8bd7cbfe580b48eca13c4f686fff3a50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/59615131398.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/49279661965.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/polygons_worksheet_grade_4.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_8a9805a7f8f94b42a2eddc7fecd1a410.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_19531d18b31c4654b487ea085a8505ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/2019_acura_ilx_6_speed_manual.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_e2e81c81d27e42d198e77eda9edfe5c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/29729705853.pdfIn PDF document text
    • http://wiloradakuno.onlinewebshop.net/kumeruzazufubowiboju.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/umbilical_cord_prolapse.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/77611174022.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/67570846251.pdfIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_67a83a98cc0341a09ca0e14b7f7ac100.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lepefi/81873973779.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 4872 bytes
SHA-256: 811c176ad83e618c90df44d9fd936e5ae5524abab931c5f6982485dd661512da
font_01_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 10316 bytes
SHA-256: 7e102a09596cea010035dd0ee4b872a30201140cd3c82f4e57e730fec2569ffa

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