Malicious PDF — malware analysis report

Static analysis result for SHA-256 8037ca3f9b4ac80d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 06:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42e3486fa6e23161180e0eb0e809909b SHA-1: 1403b4db17f467afe0c39e1755defa913612c9eb SHA-256: 8037ca3f9b4ac80db9c7f5349bff1abcf7f0c30ab228475e49550181dca5c337
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, designed to trick users into clicking a link. The document redirects to a link farm hosted on disposable domains, increasing the likelihood of malicious intent. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/47921643322d26e262b258115d01460a/39406892281.pdf In PDF document text
    • https://groupburuemas2.com/contents/files/33230850380.pdfIn PDF document text
    • https://parkettworld.com/upload/files/kalixupovuxuduv.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/xejunanitajetu.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/47049322298.pdfIn PDF document text
    • https://ksuskalology.com/images/file/nuzexabevapoko.pdfIn PDF document text
    • http://fabtur.ru/upload/files/17070074799.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/65797247764.pdfIn PDF document text
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/11927651780.pdfIn PDF document text
    • http://smirna.pl/files/file/jopemetulagunozapex.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/kamumetikavuremafukesoxix.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e43540264b1b8970a238d1e68a138e7f/mobujiraf.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/likubetukurup.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/datitozizo.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/44017840917.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/99520296644.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/dumidanobapanufujolodewol.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/jafegopexitozarapef.pdfIn PDF document text
    • https://eclearusa.com/images/file/68538303631.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/38008907717.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/warixulelifudikesav.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/70099585571.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/vubolotegubupabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=nuclear+physics+lecture+notes+pdfPDF link annotation
    • 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_off0000b1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DB 10908 bytes
SHA-256: daddad4dea74dc2ca043ff823455c37ec4545a1ae12daff7d2a82f4a07b59024
font_01_sfnt_off0000cb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 14100 bytes
SHA-256: 5b119b36d21b99d6277f77cf9e3a73c129e53765e6a0b8abf0d688cec93983cf