Malicious PDF — malware analysis report

Static analysis result for SHA-256 c674de64b3c9c528…

MALICIOUS

PDF

62.5 KB Created: 2021-01-21 14:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e501b637a13fe27da5577ff7d2b8b0fd SHA-1: ecda77e5f6a83790d3ade66e0ce06357a7d0113b SHA-256: c674de64b3c9c528db40c3c7efda3ab2a630ee7fec7d3796612dbbd36d59e28e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a link farm or SEO spamming attempt. The document body, though heavily obfuscated, suggests a 'truth table calculator' lure. The presence of external URIs and a high ML classifier score strongly suggest malicious intent, likely to redirect users to malicious sites or phishing pages. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://leonvi.ru/123?utm_term=truth+table+calculator PDF link annotation
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/fogof-mekawitofata-sugabepukegezom-vijevo.pdfIn PDF document text
    • https://siwepuxerit.weebly.com/uploads/1/3/0/7/130775843/kodijuraw_ninodoselilube.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/a66776eb.pdfIn PDF document text
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/daac954ad7f33d.pdfIn PDF document text
    • https://wumefabifu.weebly.com/uploads/1/3/4/8/134888429/suwesorem.pdfIn PDF document text
    • https://rabuwamefikulo.weebly.com/uploads/1/3/1/3/131398373/5368b9.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/ed8bf72958b0f.pdfIn PDF document text
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/285061.pdfIn PDF document text
    • https://fabegobidik.weebly.com/uploads/1/3/1/4/131437275/9b240.pdfIn PDF document text
    • https://xelegiri.weebly.com/uploads/1/3/4/4/134435730/84f0ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379722/normal_5ff0b14409b66.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/muvojugejoxip/expense_sheet_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/numuzukijumosi.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/josezumetis.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/58682792993.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/zaluxibewasovoxelok.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/dstv_tv_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/39718326869.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_off0000b80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80B 4800 bytes
SHA-256: 8ea23506926c1d28d9eff60b73d31f5a0388acec5224ffada57aae56a14129cb
font_01_sfnt_off0000c853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 10824 bytes
SHA-256: 6eaab0f7b07417db935f542a6674f43f57ca5075ae23ab6a34164822ccf2e912

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