Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f333d4fc2939d6…

MALICIOUS

PDF

78.2 KB Created: 2021-03-16 00:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ebf207045b750db80371826366eb59b3 SHA-1: 3f336c0802c3c5b252d9a986d93271557389c143 SHA-256: 61f333d4fc2939d6416e60d7b1f3a5155d551bb2782421af1f332e8a9a0b1e4a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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/123?utm_term=flyff+bp+guide In PDF document text
    • https://japarikadag.weebly.com/uploads/1/3/4/1/134108792/bokekadotuxate_fejivexadewi_tiritekuk.pdfIn PDF document text
    • http://gakmancreatures.ru/knights_chronicle_pvp_tier_list9s8a7.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/54173354597.pdfIn PDF document text
    • https://xilasofuvi.weebly.com/uploads/1/3/4/6/134651230/aaba81c3e9a.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/pogexoz-vadaferaju.pdfIn PDF document text
    • http://br1.red/vokasitunuwinagomofone3ghfz.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/putufik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530171/normal_6035b4e8d5d75.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/475_tax_deductions_for_home_based_business.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_6012a32c919b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387586/normal_5ff0e7f83f61f.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/air_fryer_recipes_for_frozen_pork_chops.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xupimaral/68515821370.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/75142722404.pdfIn PDF document text
    • http://fuxazulofonu.epizy.com/carson-_dellosa_cd-_4301_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/audible_books_to_ipod_nano.pdfIn PDF document text
    • http://bopexetosezulav.rf.gd/41260527172.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/bruker_axs_d8_advance_manual.pdfIn PDF document text
    • http://gixisenusadat.rf.gd/amazon_ec2_cloud_computing.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/wefozesomuwusidinemisixo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 4508 bytes
SHA-256: 305a4a7b818e4ff74b2bf01d378ca9949a413949140145d99d2a39716a672fed
font_01_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 11244 bytes
SHA-256: 8d94803eb53a3f3cffe8b2c5d1b1d8b2a13823d49c6b6045ed83d4adf8735884
font_02_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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