Malicious PDF — malware analysis report

Static analysis result for SHA-256 f319c7bfb0f231bc…

MALICIOUS

PDF

91.6 KB Created: 2021-06-06 14:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57c45f922806046c2cc8b691bbfa7f5e SHA-1: 99b2feb83f1fc410a2b05e4e2435a9f79de5fa0b SHA-256: f319c7bfb0f231bc7615600c2d8a4e9bf341ef034cc6c7cfa0e18ef26f79c84d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://irlanc.ru/pbw?utm_term=asi+se+dice+level+1+textbook+pdf+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449172/normal_6000f3d8e16ca.pdfIn PDF document text
    • https://magirodimape.weebly.com/uploads/1/3/1/6/131637482/bosevexavopopovu.pdfIn PDF document text
    • https://linazigamatamab.weebly.com/uploads/1/3/1/8/131856602/lezix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_604871b30317f.pdfIn PDF document text
    • https://rifakinuzofu.weebly.com/uploads/1/3/0/8/130815009/7bb32038a795.pdfIn PDF document text
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/6666983.pdfIn PDF document text
    • https://fozaxebefi.weebly.com/uploads/1/3/4/5/134584315/3899079.pdfIn PDF document text
    • https://rororejiwep.weebly.com/uploads/1/3/5/9/135966539/pipenoguwipipo-gitolesori-niguwul.pdfIn PDF document text
    • https://xezujexowesujol.weebly.com/uploads/1/3/4/5/134502134/dowaregaxepofal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_6062b00104b23.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4422620/normal_60b05c04b0f70.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/8eb2696e-58c8-453c-b028-16846c6e39ea/tupagotomexefukalop.pdfIn PDF document text
    • http://kumarifili.pbworks.com/f/the_gift_of_the_magi_story_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4829d7f-f1cf-4a5d-b9c7-e46d17d5c434/es_file_explorer_mod_apk_black.pdfIn PDF document text
    • http://pojaweku.pbworks.com/w/file/fetch/144463980/loxiwunupaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f6dd13-580a-4a32-bedb-8bee4e68ed4a/3539904192.pdfIn PDF document text
    • http://jazonewu.pbworks.com/f/secondary_math_2_module_6.1_ready_set_go_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a615018d-9d9d-494e-bccc-659f036199f9/oxygen_49_keyboard_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f12574-0eaa-4356-93c6-4c7bda882ad4/what_is_the_star_method_interview.pdfIn PDF document text
    • http://rilewikem.pbworks.com/f/naruto_shippuden_ultimate_ninja_storm_4_apk_3v3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143a909e-388d-4857-80d0-4fee41c4b1ba/63510818089.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_off00012385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 5616 bytes
SHA-256: 280788510db4a010389c7e961fff72374fa9b73e785051d6042108d299c77ea6
font_01_sfnt_off000136cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CC 12320 bytes
SHA-256: 7cb396dd430e733581277c53668ffe1923f40f2d4aeef745cc823a1254198bbf