Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc392016b3429e2c…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 10:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44999e6eccfc40d18519b84593cfb27a SHA-1: 0afebbad75730b5b811ded7d7007a6e605ef527d SHA-256: fc392016b3429e2c9504ca10e1ff4dc29a57604ab5fb1de42aa09b3acc5a784c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, likely to distribute further malicious content. The presence of numerous unknown-reputation URLs supports this, suggesting an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=describing+words+that+begin+with+b PDF link annotation
    • https://crownprolaw.cn/userfiles/Proj_Name/files/46444444714.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/sedelusolonuvumu.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/67639192065.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/fetive.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/vufekiboduwonive.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413af7eb659---57270305228.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/89403044420.pdfIn PDF document text
    • https://nasikampung.info/contents/files/66471441345.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/43152620512.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/tojokimenofaje.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/29154637674.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/kumow.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613994dfb936c---3549481860.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_04_03_22_22_3921.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/40217682765.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/45103798653.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/37572052774.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/tugugisidetaropamu.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/17128509623.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/zakakufosunesorejizogaj.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/94237886469.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/31729301554.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/zazewutotokigopivexepozo.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/damosopokudivep.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/14651870259.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_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 10828 bytes
SHA-256: 19fc7e2c8e190cbe371b83418f0c1b881c1f601c6fe3e1438a8045bece4f4207
font_01_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 18624 bytes
SHA-256: 979ac29863ba6295aa6976b578795b37d7b99fb6b595aa2b0f1280c693f40fd8