Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c7a7d1344d28e8…

MALICIOUS

PDF

61.1 KB Created: 2020-12-07 04:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3090f5db6142910a6778a20a84a914de SHA-1: 16476e6fe08d0eb8c59bafcb12c4ea3ec36a34e2 SHA-256: 62c7a7d1344d28e8e1af30a5058cf939847451e9ac39eac5150136846228cd73
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/123?utm_term=planet+of+the+eyes+trophy+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_5f8cbbda3d501.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/3050584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5fa0ca62ef74e.pdfIn PDF document text
    • https://fodorofofojep.weebly.com/uploads/1/3/4/7/134769626/pamoru.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.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://static1.squarespace.com/static/5fc77b03100abc42af3daada/t/5fcd72595d2e6f3bda51cf88/1607299674504/wands_mod_1._12._2.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/53648685538.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/wobinulimewuvitulunekaj.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/cicala_e_formica.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc181a368612547ed627098/t/5fc5bb912dd96f5918b4149f/1606794130500/tojidetojefovikugawa.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/limiting_reactant_questions_with_answers.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_off0000a96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA96D 5288 bytes
SHA-256: afd1cd374d8bbbf1e40e7dadc758058190c7b4ed6fa7ae3ecc1a2ed447d24338
font_01_sfnt_off0000bb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB63 8852 bytes
SHA-256: 53cd98a80c209e67d3e7eff25f4892aed0b6cb80ef221e4d3e9b5443826e2335
font_02_sfnt_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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