Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25dc7089bb223cd…

MALICIOUS

PDF

75.1 KB Created: 2021-03-29 17:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4463c6e2503be8000d36c1121b8f7691 SHA-1: 81ec324e5a0ef2fad76b45e46096a3bb4c6e47ae SHA-256: e25dc7089bb223cd35f03c0bb6d7d81b2f2d2927196c5cabd5ac4d9a7fbdc6da
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDFs hosted on various domains, some of which are identified as disposable. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=gates+industrial+belts+cross+reference PDF link annotation
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/b70ebf6d.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuloka/IicPigp/zedopefobapudijifa.pdfIn PDF document text
    • http://tokio-2020.fun/53441877115idqb3.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/1119017.pdfIn PDF document text
    • https://nirusiji.weebly.com/uploads/1/3/1/4/131407521/xivovo-gapafijiniwelow-xuruxogaxupu.pdfIn PDF document text
    • https://wipamixupes.weebly.com/uploads/1/3/4/4/134460990/marizemid_demap.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/jgcjhif/gunukajuzomaginu.pdfIn PDF document text
    • https://togurugake.weebly.com/uploads/1/3/1/4/131412858/mokiti-daviwi-menesuzevuti.pdfIn PDF document text
    • https://kivogumit.weebly.com/uploads/1/3/1/0/131070776/gulosumesin-taxev-mubuwudi-xavizinurula.pdfIn PDF document text
    • http://epaytds.xyz/47608681231x6zck.pdfIn PDF document text
    • https://rabizelen.weebly.com/uploads/1/3/1/4/131453176/c80330271e0.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/Y3mUQII/lolorezagalatus.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/cicgjhg/traffic_racer_extreme_mod_apk_rexdl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e84bec-fee1-4923-9dc6-4b023c62a167/24017585796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c947fe3-7891-4d09-b392-55e7337854b9/the_art_of_unit_testing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9039d5e2-7928-4894-8dec-abec7a066d13/joseba_achotegui_sndrome_de_ulises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff7fb02c-974d-4a2a-9c67-4b8d1d330cc7/keurig_b60_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93de5086-89c5-465a-b90e-20282ea3ac1e/pride_and_prejudice_summary_chapter_14.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535ee770-87f4-47cf-8a0f-ab978e7a4966/argumentative_essay_format_for_high_school.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
    • 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_off0000d34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 5188 bytes
SHA-256: 86b0964682ab1ec840e88cc10c2754a6a312aab16c5ab17152315df1441f3574
font_01_sfnt_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 10528 bytes
SHA-256: 24c63a0c2878e2a3e08d096bbd84eacfaad76fe186b3a571dd1a254281fa85a8
font_02_sfnt_off0001092a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 16216 bytes
SHA-256: c88192de7f728a065e9b063f65df003ef8ffe0f98852d5d4585c5b46180f330e