Malicious PDF — malware analysis report

Static analysis result for SHA-256 1638d9a17291c12a…

MALICIOUS

PDF

71.7 KB Created: 2021-03-22 22:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d56b95f1a6672fb72dbb355bfeb69613 SHA-1: 947f0d3c8da4ed7ff00a5a23f5a27242e50ecd0f SHA-256: 1638d9a17291c12a15648c59621024ebe09bad66db3356ae3b6297a93b0b0c93
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://crophysi.ru/wix?keyword=super+mario+64+beta+revival PDF link annotation
    • http://viwowiziboso.22web.org/nios_assignment_front_page_in_english.pdfIn PDF document text
    • http://neuroncraft.online/nonijajezerivezonikukisen1q3a8.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/how_do_i_sync_my_harbor_breeze_fan_remoteu89cq.pdfIn PDF document text
    • http://xejapuz.getenjoyment.net/cbse_11th_biology_textbook.pdfIn PDF document text
    • http://merulabodonulu.iblogger.org/gezaxogakobuvufogubugudo.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/malutovodepesekoluvajo.pdfIn PDF document text
    • http://blognews.top/ragnarok_mobile_priest_guidejpu4y.pdfIn PDF document text
    • http://kezerojipogut.iblogger.org/pubokegezopebejuzaz.pdfIn PDF document text
    • http://segwaywheelchair.ru/1136168838ewgk9.pdfIn PDF document text
    • http://saxosoxajivovud.medianewsonline.com/fokivoserenovuveru.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/e871060a-4dd7-437a-b1bf-934a35c29794/best_sci_fi_fantasy_books_of_all_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1185ad2b-946e-4f8f-b572-d478e54b262c/lonifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb52eaa8-b761-4d88-ab96-7a77ea812ad1/jandy_jxi_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c47ab39b-6b80-4076-b4c9-88748b810aa9/tafoliwuvukunurin.pdfIn PDF document text
    • http://vifidumefitur.atwebpages.com/53119229902.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/16287286187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a39855-f7dc-4cd2-9d36-b573ee312c5c/92439987920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d397dbb6-6d7b-4971-bd7d-17aee6df3a76/5752143326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed0728b-143c-4a69-b884-b6b0ad565531/what_is_the_best_welder_for_a_beginner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fac7e6e-4904-49c0-a893-6c99bbadbcaf/latitunomigeg.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/91952018533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1110f760-6e0e-4385-8f5a-0c210c9ed152/91899442625.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 5332 bytes
SHA-256: e521ed1ce145f8479840ace48d13cd87cdbb09ba648dcd7549aa7a744fc1fa11
font_01_sfnt_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 9964 bytes
SHA-256: 80dbca26064a4ad3958bcea06506868e8ba75ad3d6ca3634c7e6d426d27ad56e

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