Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72d263258d07530…

MALICIOUS

PDF

76.8 KB Created: 2021-03-31 13:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 196b1bb9778587589824be0f45350da6 SHA-1: be0afd2b3a1f89edb155d947d74811ab5007f053 SHA-256: d72d263258d0753032cc9811e15845853a5d58d4e0f9c2f5748c5c0a4e989d14
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms and redirectors, indicating a malicious intent to drive traffic to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=booking+revolution+2d+mod+apk+wwe
    • https://cdn.sqhk.co/pizililiv/rIvhcH6/best_photo_collage_maker_mac.pdf
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/2164588.pdf
    • https://cdn.sqhk.co/bagudivibi/iajfjfE/pugetulonojelun.pdf
    • http://shoop-fo.ru/1994_softail_service_manualkedig.pdf
    • https://cdn.sqhk.co/vovewotutal/je7A3hj/58906730162.pdf
    • http://secret-empire.ru/xirududomidijalodus3liy.pdf
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/3183426.pdf
    • http://opt15.ru/self_reliance_lds_talkskdfve.pdf
    • http://pesisasije.22web.org/fotudemogegatebap.pdf
    • http://kegeminu.iblogger.org/lovede.pdf
    • https://lozatovetifeg.weebly.com/uploads/1/3/3/9/133999134/5128543.pdf
    • http://wiinorama.website/what_are_the_best_horror_movies_on_amazon_prime_right_now07xs6.pdf
    • http://merovew.xyz/masizebabewubuvebabhlpo.pdf
    • http://qrettalq.online/grandparents_in_spanish_language0x59w.pdf
    • https://cdn.sqhk.co/bitaxukezor/50Eg2Oo/14886276108.pdf
    • http://svoytrylend.xyz/ibni_kesir_tefsiri15bw6.pdf
    • https://cdn.sqhk.co/baresupujar/djjidQU/multiplayer_tower_defense_games_android.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rusuxagek.rf.gd/tusagegiduj.pdf
    • https://uploads.strikinglycdn.com/files/f212f6b6-e0d4-4a4f-868b-53d797d02282/fenofuwezarowikagurorigum.pdf
    • http://ratamam.epizy.com/lateral_epicondylitis_treatment_exercises.pdf
    • https://uploads.strikinglycdn.com/files/e465bbc5-0c86-4bf6-be33-23fb1eb53cd2/foxobexowatugilixubilu.pdf
    • http://dijibitaxu.epizy.com/34512640676.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_off0000ed6a.bin
7a66afc70ea584b818d72f59f0778130542424c30e6884a9caf356437b7bb725		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 5496 bytes
font_01_sfnt_off00010021.bin
c29c553f065144d2b71743402c56b67e5bc5e13ba1fcc58ded9644486d18b9d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 11016 bytes

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