Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e76fbf1af50297…

MALICIOUS

PDF

116.6 KB Created: 2021-02-20 20:15:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3f49620464ac309e5fa9e355ca8724e5 SHA-1: dd8108b4a5bb1a3cc60e2d706e9a27fd4b751876 SHA-256: 71e76fbf1af50297cf401bc6315f0c6f2b23ca2535f433559fb5fe93bc9217b1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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://maypoin.ru/wix?keyword=cyberpunk+2020+rpg+pdf+download PDF link annotation
    • http://chaptejvxz.fun/pathfinder_kingmaker_gm_guideklm0v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_6015cdd5a2f75.pdfIn PDF document text
    • http://bestgirl69.com/pentair_model_320_chlorinator_manualpkle8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368489/normal_6004d1185d326.pdfIn PDF document text
    • https://vomimefime.weebly.com/uploads/1/3/5/3/135316042/vagizek.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/lonakixudez-lesarujati-sejelirideme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408598/normal_602d8a4e3cc39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5fd63b46da316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_601f1c48411b6.pdfIn PDF document text
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/28befc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422631/normal_5fe05c664fa8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467306/normal_5fdf814aec85c.pdfIn PDF document text
    • https://pefisidedufe.weebly.com/uploads/1/3/4/9/134902532/dapigibivew.pdfIn PDF document text
    • http://sesalon.xyz/critical_incident_report_definitionaoe2g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 6872 bytes
SHA-256: 681ea55951b275f4f89fc3daaed2b85a016daafb0ff67691be2531c9cd49f565
font_01_sfnt_off00013c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C14 4780 bytes
SHA-256: 46121fc0a7cc3e0d817675b49d1747fe06a7b6de7254be9dfd4bc7317fceaba5
font_02_sfnt_off00014cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF2 5608 bytes
SHA-256: a26e4edcae9fba5cddab089c5e787191f86e4c6af4a6ac9bfb7356b808e14f5b
font_03_sfnt_off00016032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16032 19484 bytes
SHA-256: 6d00c9b89217e2f5cbd261bf4a2682da5c2ac656dc3e902430aac6d22eacc0e0
font_04_sfnt_off00019b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B61 17312 bytes
SHA-256: 1ad08734ce2a871d4c264efa0774e1e56e12e67cc966c229462026daa94f3663
font_05_sfnt_off0001b4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4C0 6084 bytes
SHA-256: 8512269ce3723a6a18763406047bf93d38c1a9ea98fb3e983252d8412931e3a1