Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d660e4fd88fcce…

MALICIOUS

PDF

85.0 KB Created: 2021-04-26 18:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8f34e74f49261963538c8fe99d2cc120 SHA-1: ea2bb4bf3a72547d638ab0cf246d8b305bc1b875 SHA-256: f8d660e4fd88fcce31f699a40dbf1b40c4a176fcb16b33dd71c895b0fed2e69b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links, many hosted on disposable domains, indicates a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=trig+ratios+for+right+triangles PDF link annotation
    • https://cdn.sqhk.co/vobevufubito/je6ijha/lajilixukevele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_60443a1e3c375.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/w4mifOq/83177943670.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/Ziitidm/class_8th_science_ncert_book_solutions_chapter_16.pdfIn PDF document text
    • https://cdn.sqhk.co/gozolijitow/jLogcgh/92491127554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_602f9f1375f21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427079/normal_5fc9d2f812985.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/pupotazawutemimuzuseje.pdfIn PDF document text
    • https://cdn.sqhk.co/gasalikuviz/hdkLihq/cakeflix-_baking_recipes_cake_decorating_tutorials_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/I1hhbgh/soccer_hero_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/a3jdXjj/boost_trampoline_park_covington_ga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_6055f8cfeeadb.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/metodo_aprender_italiano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_6012bf0866b0e.pdfIn PDF document text
    • https://cdn.sqhk.co/donewipimep/jihbhbM/53423814430.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/hkbsmdY/winkbed_plus_reviews.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/ateten_gmlek_roman_tahlili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/67966630496.pdfIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_ead7e0978eeb490fb981b8c6ea850ec5.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_ac5c2147ddb04b9db9683a1b9ddfc8ab.pdf?index=trueIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_8d804862b7c348db9b442a8964210e7e.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_5b5b8033231e46189ebae743d1ee093b.pdf?index=trueIn 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_off00010e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8C 4976 bytes
SHA-256: 3cfe94d168b6e2aa3496f25a26c3dc87f94cf177d13fe64a9828659a1f0d5007
font_01_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 11384 bytes
SHA-256: b7e857bb366611512d7209ed5837b59decd3f7214fa34c819248c81c88f87ce5