Malicious PDF — malware analysis report

Static analysis result for SHA-256 992c2d34c40a743c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-22 16:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d10bc65f3ac9ecaa786b5f158bc8743a SHA-1: c7c2ea61d8c85512e839d5ccbcd6b0d99733286d SHA-256: 992c2d34c40a743c4fd99eb7ee62649fe3f6f46350611ac2f6073b7d5eafceea
186 Risk Score

Malware Insights

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

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 0.9996

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://druttle.ru/award?keyword=medical+physiology+ak+jain+pdf PDF link annotation
    • https://zejobivajetipud.weebly.com/uploads/1/3/0/7/130740466/9753831.pdfIn PDF document text
    • http://negifowutagur.mygamesonline.org/biology_practical_class_12.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/free_blood_pressure_chart.pdfIn PDF document text
    • http://ig-about.net/tesatutunutozomojiflvp.pdfIn PDF document text
    • http://hookup757.fun/44674589622tde5h.pdfIn PDF document text
    • http://raraveluwogevuw.mypressonline.com/how_fast_does_phototherapy_work_for_jaundice.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/falevemitosu-wovenixipebekun-kesewobik-rizuxip.pdfIn PDF document text
    • https://widafesisitix.weebly.com/uploads/1/3/5/3/135321065/9970860.pdfIn PDF document text
    • http://morasuxod.getenjoyment.net/brown_and_tan_long_haired_mini_dachshund.pdfIn PDF document text
    • https://fibarivinudew.weebly.com/uploads/1/3/5/3/135387866/beviz_xugufoxibakiluz_towomanizo_mumuxaru.pdfIn PDF document text
    • https://nusosujorogu.weebly.com/uploads/1/3/4/5/134589145/fudelilisekil-dadiw-nadapug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_53fdd0711f60437ebf86c920a0791938.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_554ba6e960324963b6058c9318f06dad.pdf?index=trueIn PDF document text
    • https://acda325f-ee3b-40e4-882f-fabc489a6840.filesusr.com/ugd/23b3d3_cbf92f1855ee4acdb9028588ee556d63.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_6168f5e6f0c54fa5b9a9e4c8c4b02dd9.pdf?index=trueIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_1ac5c6c97d474b2d9c9db539a56efc11.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_709484f8899945debc0376a06cc10c80.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_3ef98a8359a5421b994aba52b2eeb027.pdf?index=trueIn PDF document text
    • http://lijowavatajo.myartsonline.com/captivate_us_watermark_chords.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_ea480fd02de5403bbfb3581b70e46b4a.pdf?index=trueIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_aaa671d36f1e40c6b9ce73ef2b1f89eb.pdf?index=trueIn 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_off0000cd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5F 5568 bytes
SHA-256: 7df53b8f2ef628207f6ede15bc283560561ed4276970adc45a6e879127652188
font_01_sfnt_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 10688 bytes
SHA-256: 43f1de04b6cbf070edcbfc279485ffb830feddf61aaa660165dc5db8adf2e903
font_02_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e