Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c71fed2faf65fff…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 03:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd7a522b37be5dfc217abee64165504f SHA-1: 2ef0074c680297f48a75f1d9918fbd398409bbd7 SHA-256: 1c71fed2faf65fffab28b3e0249a054fa4bc77a1e6b6439fcdb305617381c485
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://philabc.ru/uplcv?utm_term=cellular+respiration+escape+room+answer+key PDF link annotation
    • http://ajk-opakowania.eu/upload/fck/file/mejifoduge.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091414334713.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/viberipal.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/piropuvi.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/files/9955864289.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/jufen.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/69763429771.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/xobizupafaxuzikomesosu.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/visonadi.pdfIn PDF document text
    • https://priscar.com/documents/files/jejovajenaviwixen.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/kekezijaremoxajebuve.pdfIn PDF document text
    • http://activsport.ro/userfiles/file/8390884847.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/8722806605.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/tusimibomujizunemutenolo.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210905012329.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/69085738663.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/60717898816.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2e022626---82299323312.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/79426713646.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-16/20210916181210438120.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/62414996065.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/61518523690.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613404dd3b9ea---xutarinokexo.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/dasano.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/80341657551.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://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_off0000e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 18948 bytes
SHA-256: 9330db9aab84c1bca1cb1e3ddf2e4c52d426dc8ae23aa570d503f358f48ecdfe
font_02_sfnt_off0001330a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330A 10956 bytes
SHA-256: a424b653db6c155f03edb78f683715d234f14a674f5e5159cb4cd5c4ee7691df