Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba31020b7338dd2…

MALICIOUS

PDF

64.2 KB Created: 2020-12-26 16:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cc4ed32d2aefe4227730866c117b1402 SHA-1: e7dc3feb3597c7db9c9cdac39aefa56a36a2d3b3 SHA-256: 4ba31020b7338dd273849119ff593ab16aa7356f32fc2f40002094ac79359349
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for redirecting to known malicious infrastructure. The document contains numerous embedded links, many of which point to disposable hosting and utilize UTM parameters, suggesting a phishing or spam campaign. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of multiple malicious links is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://traffine.ru/aws?utm_term=solution+architecture+document+template In PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/6313720.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370265/normal_5fc46996dc55d.pdfIn PDF document text
    • https://cdn.sqhk.co/xotabuti/lEji6ic/14386136880.pdfIn PDF document text
    • https://mologikonazo.weebly.com/uploads/1/3/4/7/134706863/8183505.pdfIn PDF document text
    • https://janaravepok.weebly.com/uploads/1/3/4/8/134886337/8262999.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5fcc18c5001c3.pdfIn PDF document text
    • https://lemurowivavaxub.weebly.com/uploads/1/3/4/4/134404776/85c28a831119ab5.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/zepiwob.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/AHgenAN/76082816154.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/soxupabolapazujudub.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/wutezigojuxi/icd_10_code_for_chiari_2_malformation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de7cfed-11b5-4d24-b26b-4c244830e1f6/13159952628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/447207b5-ff36-4774-867e-d58f62585816/pajoluduwox.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/vasekegozuvafabilupibeg.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14E 5240 bytes
SHA-256: a2c016f4e34a572b921edc66129dc88374c89afea61cfa38532f51d3c24de44b
font_01_sfnt_off0000d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 9856 bytes
SHA-256: e168bc000cf2998bcdc8ec79908723f3272a92981b2c11903e38a3e463540398

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