Malicious PDF — malware analysis report

Static analysis result for SHA-256 0757bdaa1887b17a…

MALICIOUS

PDF

120.8 KB Created: 2021-03-25 09:18:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 937f1ea40c52c6a78d1f81821dc31f3a SHA-1: 8bde5242dab7534a74f7e7bea33916f30d390f0d SHA-256: 0757bdaa1887b17ab16c7f4468452a93f30d180ff77999bbb9ff6a57bedf6687
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/wix?keyword=canterbury+tales+key+facts PDF link annotation
    • http://potuduwatolebu.mywebcommunity.org/kuxateloropozagajewigi.pdfIn PDF document text
    • http://xufulop.iblogger.org/36809684109.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://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_056a56bcf17942db8c52101a5dfa7051.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_b4e2a2fb56a8481ea2c2b652476d6f18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/nevoxar.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/93589461678.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/64447992030.pdfIn PDF document text
    • http://kuzixejupizago.epizy.com/experience_certificate_form.pdfIn PDF document text
    • https://4a5bfc55-71df-4474-8f3e-9f6aca65c64b.filesusr.com/ugd/29b6ce_aa76b59fca524f0a80cb12734161ce30.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemazun/practice_dangling_and_misplaced_modifiers_worksheet.pdfIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_2318d1af92ec4e278970afe8f1ea175f.pdf?index=trueIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_a47d07c2c395464a8002454e4ee9b2b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/5397946588.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_cf59a132bc92406994e530567d054b67.pdf?index=trueIn PDF document text
    • http://zuluvegutadetu.epizy.com/kaguwirinubusavebet.pdfIn PDF document text
    • http://telosizaba.onlinewebshop.net/what_does_the_uncle_sam_character_represent.pdfIn PDF document text
    • http://zemoriwakaxi.epizy.com/41366452441.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000177d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177D2 4928 bytes
SHA-256: 126f73c601e43b1522e4d5b09edbf5bbf934dede086cf88a9ec0f3feb75674ee
font_01_sfnt_off000188b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188B2 12728 bytes
SHA-256: e4fd14f219e3877bd09a8e74b2dc7085fb5b82924eed3ad2ac76012db62ce29e
font_02_sfnt_off0001b2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2D8 16100 bytes
SHA-256: 26b31ba2131ae2f7da025a7fda5e9dcfe79fc1d25f6641dd8c13613e564b4b69
font_03_sfnt_off0001c7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7B0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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