Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88930f3133cc93b…

MALICIOUS

PDF

79.2 KB Created: 2021-03-19 06:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2fce96532b7a038f1d15f4f892035831 SHA-1: ea713dc380ae59d4b3b4131c904c9c2c20b41ba9 SHA-256: b88930f3133cc93b3473c5428e325fc2374f9548b5ddb3689baf5a8e5dddacdf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs is a primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=misbehaving+the+making+of+behavioral+economics+richard+h.+thaler+pdf PDF link annotation
    • https://gawufuxawejax.weebly.com/uploads/1/3/1/8/131855981/rekax-wigovab-kexepap-faxopuxutede.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415782/normal_5fe5004da2204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368777/normal_5fefb4b6177f1.pdfIn PDF document text
    • https://dobivevoxopu.weebly.com/uploads/1/3/1/4/131453544/e9b3e82b930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_601d0b8b0b53c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453550/normal_5ff3a7d035969.pdfIn PDF document text
    • https://cdn.sqhk.co/newuvuze/Vwjijdq/kunezovaravafofed.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/hiPhjjh/saber_el_saldo_de_mi_tarjeta_alimentaria.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/Xqns8bU/s_chand_physics_class_9_chapter_2_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzozuni/je0alic/koala_bear_stuffed_animal_donation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414487/normal_5fe41eb4ea1d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444366/normal_5fcff6ffb2576.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490369/normal_5ff892b08caee.pdfIn PDF document text
    • https://navikeput.weebly.com/uploads/1/3/4/7/134755574/zaxafokorej.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/8f4f5d57-912e-407f-b83c-ad0c734cbbd6/how_to_change_ink_cartridge_epson_xp_205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c31981-70ac-4e2e-ab0c-6acc2c236070/the_tempest_movie_review_helen_mirren.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/kai_sa_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/does_roku_have_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81a3b55-f991-438a-81e1-8e98f8ab07b8/zosuvenipaguli.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/sonos_1001_error_code.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/what_does_the_mandalorian_say_to_baby_yoda_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a662456-a646-4677-bcb0-ebc7bcf6e291/how_to_become_a_spy_cia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603bc97b-26d2-40b4-b33f-9eb34fda47ff/zogemivosaxowove.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_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 5868 bytes
SHA-256: 2fa7990b81e625ad8f459af57a34213add3883003792ec8a6dca8facd31810b2
font_01_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 11156 bytes
SHA-256: a7f473a7e898b02b07a95b8f2134a03f93e9414d502597a5dfa835b0839755ef

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