Malicious PDF — malware analysis report

Static analysis result for SHA-256 5911d2f3915d38b9…

MALICIOUS

PDF

72.1 KB Created: 2020-12-04 13:29:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 27f54773982fcee75774e95484903ab6 SHA-1: 55d70d241e414a6e639969bddce6942f53d86173 SHA-256: 5911d2f3915d38b903e6601fe28ee0be48019d34f614b8545805c5ea099648cf
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, with one URL pointing to known malicious infrastructure. The ML classifier and ClamAV detection strongly support a malicious classification. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=star+sports+tv+live In PDF document text
    • https://wubobuxidozexe.weebly.com/uploads/1/3/4/3/134322977/fovapi_pedimidus.pdfIn PDF document text
    • https://dopozigixojak.weebly.com/uploads/1/3/4/5/134509916/679c6bdaaf5.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/xekovajinufobafo.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/7966756.pdfIn PDF document text
    • https://zemabata.weebly.com/uploads/1/3/4/6/134677216/jozoradejape.pdfIn PDF document text
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/3751de5.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://uploads.strikinglycdn.com/files/7ca73c18-a639-4479-8864-40551ba5b445/55991378462.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1c049c6d9645836281f45/t/5fc367c79d79364840f941ae/1606641608014/fewimudapiduwuzilut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1206429-27cd-45cb-aeb9-fbdf9eb28d09/practice_4-2_triangle_congruence_by_sss_and_sas.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bf1b9955c744b53ac36d/t/5fc36f37fa04221c718bfcab/1606643517068/67544410345.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6757de5c7695ca9c1adce/t/5fc781e70791337046e77c1a/1606910440040/molonadux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8cdd66-d046-4aa5-8ab5-6f899ccaf749/6287172322.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfda27a5bc066edf9fc50f/t/5fc8d2f326a3037b43457c47/1606996727115/29_april_asteroid_live_video.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d2f2d26ff1194f734ddd/t/5fc4ed8cf8cdb769c67dbec0/1606741389037/china_degree_celsius.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e394f38-3b87-49bd-ba67-62bcb26dcb9c/44729160739.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_off0000d195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 4656 bytes
SHA-256: d4fd9b21c282141609207f7f6c8ea555cb4d132853262b6b5e70bde773c0508c
font_01_sfnt_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 10456 bytes
SHA-256: 140e1797ad18bc5377f6d89581c936ec367d2fd7cb973c579efc921062766860
font_02_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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