Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0768c1305512036…

MALICIOUS

PDF

78.6 KB Created: 2021-03-13 15:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 742166bda921303aa2bbc0730a8c9571 SHA-1: 52a3cff223764bbbb7cd172bd0fc668432f4da86 SHA-256: b0768c13055120366fb0ca6d0b9a3d7c2c4965a0df23826106a11f0e6e128ffb
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO poisoning or to distribute further malicious content. The heuristic PDF_SEO_LINK_FARM specifically identifies this behavior, indicating a malicious intent to redirect users to various PDF resources. While no scripts were directly extracted, the presence of numerous external links suggests a potential for further exploitation or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://pelibifir.ru/award?keyword=character+counts+pdf
    • http://mokugujumekov.sportsontheweb.net/kumon_5th_grade_math_worksheets.pdf
    • https://static.s123-cdn-static.com/uploads/4452621/normal_600372c346d6e.pdf
    • http://tgesheff.xyz/36925376431t2rt4.pdf
    • http://creditreportusa.info/safety_1st_car_seat_and_stroller_reviewsgm4c1.pdf
    • http://varistop.site/sony_a5100_manual_focus_assist849dc.pdf
    • https://cdn-cms.f-static.net/uploads/4379854/normal_6045e19a7fe1e.pdf
    • http://lajibodomemebev.66ghz.com/video_editor_for_windows_8._1_free.pdf
    • https://static.s123-cdn-static.com/uploads/4372378/normal_600809a278e9e.pdf
    • https://cdn-cms.f-static.net/uploads/4487007/normal_601da7e80bce2.pdf
    • http://naturelofo.mypressonline.com/nespresso_machine_lattissima_one_review.pdf
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5ff4fe8255193.pdf
    • http://socialwave.me/mckee_story_valuesxzice.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1aad96f9-35d8-43eb-a616-ac05ecad54dd/wesudixoxibubiginusovi.pdf
    • http://rowodebifofida.rf.gd/libero_tracking_sheet_for_dummies.pdf
    • https://uploads.strikinglycdn.com/files/df171575-0fd7-4099-87c6-455a5b6b0576/xesezovirafizubam.pdf
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_ace1eb43b2f04f4a9225ea229b247651.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4a221e83-632e-44bf-badf-5f704c630bdd/gregor_the_overlander_movie_release_date.pdf
    • https://uploads.strikinglycdn.com/files/4dc416f1-42b4-4efb-8d77-913ef7906e3d/41354273254.pdf
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_4d1bd78ab11d4b7fb6f1b0033540ca6c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a3c27fa9-4361-4cc7-9c5a-0cc97733926b/keurig_coffee_maker_b70_parts.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f289.bin
43d94a4b466a44848d012228c73b64bb5d127a021c8c75a02eeed6481564f1c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 5116 bytes
font_01_sfnt_off000103e6.bin
8245388aaf7901125728dedd9566f514a5f4e1b5ab0dc93d9b0a557167b0d962		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 12228 bytes

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