Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab727a61777b02b…

MALICIOUS

PDF

71.3 KB Created: 2021-01-11 06:04:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0b162e4dda8019385ef6f9076d87d5a3 SHA-1: 0d4888f57153cf9aed04c4de92a476eadfa0cf04 SHA-256: 9ab727a61777b02b54e9f2e73bba67b08f675a1bbead051ebdec7f5af97b6a98
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body is heavily obfuscated and appears to be a lure related to educational content, likely to trick users into clicking the malicious links. The ML classifier and ClamAV detection strongly support the malicious verdict.

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.
  • 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.
  • 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://traffine.ru/123?utm_term=writing+equations+from+graphs+worksheet+algebra+2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_5fa09e7ec09b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421213/normal_5fc4317e8ff2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_5fa2dc8782c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_5f9e6e02938c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454670/normal_5fe23a94ae59b.pdfIn PDF document text
    • https://site-1168272.mozfiles.com/files/1168272/c_form_registration_for_hotel.pdfIn PDF document text
    • https://site-1177365.mozfiles.com/files/1177365/62782833878.pdfIn PDF document text
    • https://site-1168340.mozfiles.com/files/1168340/74706188034.pdfIn PDF document text
    • https://site-1198015.mozfiles.com/files/1198015/talking_pocoyo_free_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/hhgexha/kajupekewa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485946/normal_5fe141b4666dc.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/hjeiaC1/easy_homemade_cake_recipes.pdfIn PDF document text
    • https://wawisutifefot.weebly.com/uploads/1/3/0/7/130739430/b1b76fe38e.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
    • https://s3.amazonaws.com/kudefem/entourage_theme_song_car.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/best_guided_meditation_app_for_iphone.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_off0000cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 5764 bytes
SHA-256: 31b955b23f7f4ac5a3e10df5a79712fe6eb32dbb720339b88f2b30bed4f97b30
font_01_sfnt_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 9724 bytes
SHA-256: e26559c378ccfaace5073426347403ef9619c963fa8b8590ef739e940cba09de
font_02_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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