Malicious PDF — malware analysis report

Static analysis result for SHA-256 99859aa78d71fff5…

MALICIOUS

PDF

84.7 KB Created: 2021-03-11 01:36:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 97281a7327a42f92535e1cbf32d054fc SHA-1: ead63aedf7e67c7243e83b41d53ccd8de1cdd68d SHA-256: 99859aa78d71fff5c78730ad1066c7c3e1fa1d004941b1d13b4d9eba4b79d84a
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, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the heuristic firings for PDF link farms support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=template+for+business+announcement PDF link annotation
    • https://pizotiwedif.weebly.com/uploads/1/3/4/8/134868845/mazivad.pdfIn PDF document text
    • https://wobikuneli.weebly.com/uploads/1/3/2/7/132741052/2438825.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/30409574680.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fffa0e224233.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/how_to_count_to_1000_in_spanish.pdfIn PDF document text
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/zumokosasug.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/zigulozavelevot-juvow-zupigozukenusa.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/61293262932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487631/normal_5fdcc0d512c09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pabugevekuxib.rf.gd/23008844602.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_f669ea378e4747368802585ef9d65e24.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_6b2417490a604cd5b2cbebf772b886de.pdf?index=trueIn PDF document text
    • http://wovibojo.onlinewebshop.net/a_lesson_before_dying_chapter_5_and_6_summary.pdfIn PDF document text
    • http://pavipalu.epizy.com/edgewood_city_schools_report_card.pdfIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_7ef54d7535a443f0b735128bce0a0322.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_97086154735546d9988056ede754b16e.pdf?index=trueIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_3e8b8646a9d048ac8fcda34ed48f3244.pdf?index=trueIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_c4f29db929d44c908822fced01001f21.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_ed0eae00e2f64ef69f1f0ad51fa012c3.pdf?index=trueIn PDF document text
    • http://vobujubiga.epizy.com/tuneruke.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 5132 bytes
SHA-256: 4ec42eacbe0dd2749945c37f899b040562fb015cbddc3fb9f9d1ac18b4aff305
font_01_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 10464 bytes
SHA-256: cd5f55c4fb9b7566a2ea5fde67fe184500c70daf1bbefe43c6a79b282cfc97de
font_02_sfnt_off0001379e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378