Malicious PDF — malware analysis report

Static analysis result for SHA-256 5168e79b7733e145…

MALICIOUS

PDF

66.0 KB Created: 2021-01-01 00:27:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a61c8bde67ca3e863b5b01a9c8d48d5f SHA-1: 71232e896876087b76d84f9677ba0c9d550147ee SHA-256: 5168e79b7733e145f4c07d8786691457f157bf196f2b097882c3b5a253298d07
214 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains fragments of URLs and application metadata, reinforcing the link-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=lost+tools+of+writing+level+1+videos In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405642/normal_5f949d4550595.pdfIn PDF document text
    • https://balomufe.weebly.com/uploads/1/3/4/5/134594694/puxadusunugaxol.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/wokirubu-pegoveromavode.pdfIn PDF document text
    • https://robitejipesiz.weebly.com/uploads/1/3/4/3/134375849/44ad27592.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/wovofonabokow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_5fc11c07c8f4f.pdfIn PDF document text
    • https://towavakivuno.weebly.com/uploads/1/3/5/3/135318123/c14b18.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/f51423bc-6729-49e9-984e-16e8eca4386a/para_gostar_de_ler_cronicas_1_downlo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8425ff62-011f-44db-99ab-8f6708a13736/17304584455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1c0483-4129-4409-8a42-974dd5f87dbb/95141632648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b55a69-4b91-4960-9e26-079d8664a28e/pewijomefaxil.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_off0000bb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB83 4796 bytes
SHA-256: 0d7b3a877363e9cf47236787b93a40a307c65feddb5c4f3ae00acde766e000c2
font_01_sfnt_off0000cbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFB 9880 bytes
SHA-256: da3bd634abccadbd56d6220ef49dabf9e76bb8ebc9106bd6bd870c04855a33d5
font_02_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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