Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b4e98b74cdbe35…

MALICIOUS

PDF

82.4 KB Created: 2021-04-04 06:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9f668c45b9b8a7ff2010fb1a73bdc670 SHA-1: ec2d103b866cd24571f6e59f66c1cc5838c16e7b SHA-256: 30b4e98b74cdbe352569bd6f51a07e789ceba7dd25868115f0ce5c75991cb04b
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to other PDF files. The primary malicious URL identified is https://xezojetit.ru/123?utm_term=aetna+better+health+of+va+referral+form, which is likely used to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://xezojetit.ru/123?utm_term=aetna+better+health+of+va+referral+form PDF link annotation
    • https://nazorilorapumug.weebly.com/uploads/1/3/0/7/130776423/3159760.pdfIn PDF document text
    • https://midubumiw.weebly.com/uploads/1/3/5/9/135989619/38840ad2b24.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/xidewozujifus.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/b74b3.pdfIn PDF document text
    • https://wirukerig.weebly.com/uploads/1/3/4/6/134630703/kisoromivuwa.pdfIn PDF document text
    • https://demimawuna.weebly.com/uploads/1/3/5/3/135389973/janoweseleg.pdfIn PDF document text
    • https://rurinigumiza.weebly.com/uploads/1/3/5/3/135350695/6355a40abef27c.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/zomuzigo/tipicidade_formal_cpp.pdfIn PDF document text
    • http://juvikavirilija.rf.gd/zumulajapovovimoka.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_a8301d8f798a4e3fb17e5fa05d2087a4.pdf?index=trueIn PDF document text
    • http://nogekaz.epizy.com/music_artist_management_contract.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/exception_java._lang._numberformatexception_multiple_points.pdfIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_53b8afcb60cd4e3ba34da7c1f57ad8e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miledu/how_many_calories_are_dunkin_donuts_munchkins.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_2b423cecfa594d48b26d6d10d23171b3.pdf?index=trueIn PDF document text
    • http://vilewol.epizy.com/dapujidapigajegelinodokup.pdfIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_327df2df510940d7b46f95fbb5c3981d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/nivozagifesililiwilof.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/23045901584.pdfIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_74378d65c5c6401db93545d57c8b7ac5.pdf?index=trueIn PDF document text
    • http://kedumuwimafam.rf.gd/sidufozuvatodez.pdfIn PDF document text
    • http://wufizomofoduzin.rf.gd/5880041379.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_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 13636 bytes
SHA-256: b26bc95527f3bd266a743f68faa369542a5460acf7b0f455cc24bd378d1266b5
font_01_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 5020 bytes
SHA-256: 4c83e7a70fc4a4711c5a7fcb1f8c46bed198cd3e40844a88a57a5834049631c8
font_02_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 11872 bytes
SHA-256: 89984c997f9384ee8a4743e896857296a77d0aac7249c867a96d3eefea9c8bfb

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