Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a454cbdbb2348e…

MALICIOUS

PDF

85.0 KB Created: 2021-06-08 17:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e717768d258b6ebeca729269c9c36f45 SHA-1: c615b62c3bc6955b57aa1250b21f44a3aa5c4556 SHA-256: 10a454cbdbb2348e04d2073f17d948d6269f2e19fdd0f400bf2fdcca8f43e6ed
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URL `https://midufefew.ru/123?utm_term=je+vous+informerai+traduction+anglais` is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/123?utm_term=je+vous+informerai+traduction+anglais PDF link annotation
    • https://detalejutapebis.weebly.com/uploads/1/3/4/6/134610814/majefakiwuxugisa.pdfIn PDF document text
    • https://pekafajifazudo.weebly.com/uploads/1/3/4/4/134478446/fiwuwisakopemefepux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5fd5f6657396e.pdfIn PDF document text
    • https://jazemajotejavux.weebly.com/uploads/1/3/2/6/132681398/kagikagafu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410418/normal_5fcf47619d19e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_6012c5b47b595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474998/normal_6029e3fb47957.pdfIn PDF document text
    • https://ragojozuzaz.weebly.com/uploads/1/3/4/6/134668900/tegoluzep_raxifadadulife.pdfIn PDF document text
    • https://nunifabemavi.weebly.com/uploads/1/3/4/8/134871907/lowalugebakuvipa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473618/normal_5fc71df76695d.pdfIn PDF document text
    • https://dupafubakatato.weebly.com/uploads/1/3/5/9/135961249/199876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459624/normal_603c24a66900e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4528876/normal_60b1ade6749d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471948/normal_5fe1ae55ed267.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416149/normal_60071334b0a3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_602a77a7da8de.pdfIn PDF document text
    • https://talinupujisen.weebly.com/uploads/1/3/4/5/134591269/aad9de6990a33.pdfIn PDF document text
    • https://demimawuna.weebly.com/uploads/1/3/5/3/135389973/8229066.pdfIn PDF document text
    • https://nazugawexavidi.weebly.com/uploads/1/3/4/6/134678572/7a0d6aea05c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454424/normal_6056fa1412977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be921f78-1489-4097-8f7d-670ca8d3b0f4/tiwetegezisezutaxomagidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e6e558-9a7d-4724-af60-4731a1956a42/garilurexolarivorusoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af2f579-9fca-49d3-b53f-7ef7c90a2b4c/how_to_write_a_noc_letter_for_job.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4c14e9-0f42-4d5f-b90c-79ce9dcfbb15/merunuxajel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a295d09-c0e3-4756-9f0c-8fcd22551467/what_does_pali_mean.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_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 5392 bytes
SHA-256: d00632c4de30a38961da97984bc2539f21f86c9d7fcd6ceb68b8f8ed88df7e87
font_01_sfnt_off00011dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC2 12480 bytes
SHA-256: ddd4ff9a2c91bb4f7fd26791da2a12b1b84ee9a865a819c9e148ca631b8702cf

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