Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c717c8fb8d8462…

MALICIOUS

PDF

249.6 KB Created: 2021-05-19 00:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 53a2187365ae1491bc6a495a1b670eda SHA-1: 76b4c48d4ef0ca06eb80194836d48afea9933af4 SHA-256: 13c717c8fb8d846273ff8834518869ee9f139f3a343ee7c9d661ece43335369f
136 Risk Score

Malware Insights

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

The PDF file was detected as a phishing trojan by ClamAV and a machine learning classifier. It contains an external URI and an image lure that redirects to a URL associated with phishing, likely to trick users into downloading further malicious content. No scripts were extracted, but the PDF structure and detected threat indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/strik?utm_term=presidentes+del+ecuador+en+orden+cronologico+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392453/normal_60388b54e1707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_605859ea77438.pdfIn PDF document text
    • http://wigojomet.22web.org/basonujurowoposibuxuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_5fd392bc6a47a.pdfIn PDF document text
    • http://rujawobezixevib.iblogger.org/laser_cut_box_template_maker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368487/normal_5ff892b25bdeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476146/normal_60010c7b3ef64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422386/normal_5ffe8e57cce85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_6046b322350bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/af6a7a6f-16a5-4d22-8afd-2ecad2964949/what_is_the_bible_lens_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3230e8-b3e2-4adf-987c-a6c5d911baa2/brandy_cinderella_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1e8c2f-33d1-45d2-b157-e0e4018228e4/is_a_gsm_unlocked_phone_compatible_with_straight_talk.pdfIn PDF document text
    • http://xigunisemavi.epizy.com/medicine_generic_names_and_uses.pdfIn PDF document text
    • http://noxudabewoxedit.rf.gd/finiwago.pdfIn PDF document text
    • http://jagojatu.epizy.com/xinazugegijuxakuzufukovak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f17dd32-4a08-4ee3-beeb-3b04ac9e4551/the_crucible_act_1_study_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2b4708-c89f-4cb0-9028-84c8ef291d8c/how_to_turn_on_soundbot_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af684a24-8bb5-4d58-a67f-239f3d356ea9/27740109452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb51e39-b8f8-4ed3-a3a5-051b5a22a669/kufemadonavomotusudale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1bf89bc-3558-4b73-9002-9fb116c109e0/autocad_classes_for_beginners.pdfIn PDF document text
    • http://votuvut.epizy.com/fowavasuge.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_off00039a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39A94 5324 bytes
SHA-256: f4f23436060006230703d74b63b4e383db4896b1ffbc4d097bc56160d6e0f82e
font_01_sfnt_off0003acc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3ACC1 12828 bytes
SHA-256: f1b84b05f346e6f5b0f78b1ab4b45eaf9e75e062ef45a7d70cd1df4550bf9ee8