Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad90639a0108eda3…

MALICIOUS

PDF

83.1 KB Created: 2021-02-26 13:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d313d449604094737b842c37800b4740 SHA-1: dd0872e7e9237b88fe5a05f951494cd299725e88 SHA-256: ad90639a0108eda37265422061f2e60c66dfd3a3809d30cc9d269a9f8ea8ee4a
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/123?utm_term=how+do+i+find+my+starbucks+partner+number'. Additionally, a heuristic indicates a lure for MFA or one-time-code harvesting, suggesting a phishing attempt. The ML classifier and ClamAV detection further support the malicious nature of this PDF. No scripts were extracted, but the embedded URL and phishing lure are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://dafemum.ru/123?utm_term=how+do+i+find+my+starbucks+partner+number In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_6021873a37197.pdfIn PDF document text
    • http://dietnatur.fun/tezuwudeleka7eqsn.pdfIn PDF document text
    • http://ponexikid.22web.org/android_room_database_insert_example.pdfIn PDF document text
    • http://interbankdigital.com/19547403317r0pxh.pdfIn PDF document text
    • http://lotto-investclub.com/daxerorupapimutifesfgq1b.pdfIn PDF document text
    • http://nature-ital.space/inquisitor_martyr_psyker_skills1vlqm.pdfIn PDF document text
    • http://zakoroxani.22web.org/bhavesh_joshi_movie_mp4moviez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gawabog/luwizafifepebilit.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/ayudha_pooja_songs_free_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/gcse_maths_exam_questions_with_answers.pdfIn PDF document text
    • http://jesazujux.epizy.com/71767804414.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/69831545070.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/61146154984.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/me_khiladi_tu_anari_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/45811424454.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/wefozerogig.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/what_is_resolution_9.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 5628 bytes
SHA-256: 7c48ebd9d516e6e99f5e22d282497aa9b4df7f49df2a4d3864340b70f8d73236
font_01_sfnt_off00011a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 10928 bytes
SHA-256: 58afa95841864fc5e0f29fb581ba317da729e7505d81f83faa05e2dbde6e9534

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