Malicious PDF — malware analysis report

Static analysis result for SHA-256 964c0a46ffc1bc4c…

MALICIOUS

PDF

88.7 KB Created: 2021-01-22 22:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3e1db69d52656db3b5ddb04d5ca0067b SHA-1: ba1e69fa5bcf911d2a1a6477f3b094005fdbdc83 SHA-256: 964c0a46ffc1bc4c858e6f6d0fa9254c38846d9b4d5bd206a35d7e6fdd710bd0
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, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier flagging further support its malicious nature. The embedded URLs and the structure of the PDF indicate an attempt to disguise malicious links as search results, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=lennox+10f81+icomfort+wifi+thermostat+blank+screen PDF link annotation
    • http://rivimebowov.22web.org/42281935658.pdfIn PDF document text
    • https://nurokavemi.weebly.com/uploads/1/3/5/3/135347840/7a6d078086f0.pdfIn PDF document text
    • https://neninilez.weebly.com/uploads/1/3/3/9/133986457/8317739.pdfIn PDF document text
    • https://cdn.sqhk.co/nudabesawi/qnjfLgf/ego_sword_idle_sword_clicker_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pesenexur/hjhibih/57053047387.pdfIn PDF document text
    • https://lugilalosu.weebly.com/uploads/1/3/4/3/134314137/misidenebumomen-zawonifoj-pabijozitatuto-sozagit.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/jgjaIhg/surf_gopro_bhop_simulator_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/gjsjbme/dixavedixofokaxifoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekezaru/gifugilaxisolazipofe.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/abo_sadam_whatsapp_apk.pdfIn PDF document text
    • http://ruvedinaz.rf.gd/update_android_sdk_using_command_line.pdfIn PDF document text
    • http://wemosoxa.rf.gd/jazufije.pdfIn PDF document text
    • http://mivowejow.rf.gd/92588138378.pdfIn PDF document text
    • http://tuxizowivu.rf.gd/kinok.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_off000118ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EE 5812 bytes
SHA-256: 675550dadbeb7a20b5a437f5414cb3275bb9e33c946889afaad0533577782759
font_01_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 12312 bytes
SHA-256: 0ba180449b2ed0b40d75fbdf1224c3b0e2f1cb7e69c8f6b9e29d9d12bab32e75

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