Malicious PDF — malware analysis report

Static analysis result for SHA-256 951aed1055ce09ca…

MALICIOUS

PDF

77.1 KB Created: 2021-03-15 06:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 21b4ee06d362c2423470094b6216d84b SHA-1: 1865282f3f2c415838f48f5685d45d3d82c07343 SHA-256: 951aed1055ce09ca72db24c50e27d4253f78bcc59bda4ddc482671cec1681906
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful content.

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://druttle.ru/award?keyword=msds+cacl2+bahasa+indonesia+pdf PDF link annotation
    • https://cdn.sqhk.co/popaxutu/OIqjfT5/kosilademewutixitosivi.pdfIn PDF document text
    • https://fowaloxew.weebly.com/uploads/1/3/4/8/134881160/7a203865a98e04.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/hijhXgc/gelodosififimitunagowetuf.pdfIn PDF document text
    • https://bunixidulot.weebly.com/uploads/1/3/5/9/135964284/nakagapigilimegofu.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/A86AVii/extreme_speed_car_simulator_2020_hack_apk.pdfIn PDF document text
    • https://kijomexed.weebly.com/uploads/1/3/1/0/131069838/sojuludede.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/haDjdsH/fufeloxa.pdfIn PDF document text
    • https://cdn.sqhk.co/penavagalo/gjYgce4/11573085445.pdfIn PDF document text
    • https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/toduniw_makotud_wutovasage_gomipozakagesis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_9b590fe8936d4a12b590903f50b50681.pdf?index=trueIn PDF document text
    • http://mimiruwonaru.epizy.com/breakfast_at_tiffanys_restaurant_nyc_reservations.pdfIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_9bd964fda5b846569f94cdbc58348828.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/negonanopix/celiac_disease_guidelines_2019.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_c52a9801da144b1fa34b0112064d3c68.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98302948-58f3-4cc1-b634-0b0e61af679f/32862346457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5d7e68-1aa3-4951-b25e-f8fe1141243a/is_there_a_reset_button_on_a_whirlpool_dishwasher.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_0aa7cdfcd9c44b7eadaf2d2966be8a6c.pdf?index=trueIn PDF document text
    • http://kagabefusexem.epizy.com/bekejasarokobikewup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168c6f5c-7570-4be4-817c-f756c9e40d62/50497671010.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/twisted_pair_cable_advantages_and_disadvantages.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_0115835b732749e497d812407eca48a5.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_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 5424 bytes
SHA-256: 7180abb8b670a24d5c3e15becb7f2462cd2f10a58a8ff0ae6caceddf96ed6227
font_01_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 11024 bytes
SHA-256: 02645036f43ca8295897e8325075aaead11b1fa5b402dac0485d7fe7be8fb23b