Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e00167a7810878…

MALICIOUS

PDF

86.4 KB Created: 2021-02-26 11:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d56d28528fae8d724b1cb4db110c879d SHA-1: b2a83ac687f44f145b61b90e0fbd31975202dc07 SHA-256: a2e00167a7810878a3db491db00c3703a2b9f5a958c8c87f7bfe51170e25cf88
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/wix?keyword=persona+4+magician+ultimate+persona PDF link annotation
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/gebivalupedavegovex.pdfIn PDF document text
    • https://womawojixamukof.weebly.com/uploads/1/3/0/7/130740010/5558042.pdfIn PDF document text
    • http://marinarus.space/download_apples_to_apples_appmr8xm.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/nafanoro_bafitoremo_fesebabut_bexisad.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/python_deep_learning_tutorialspoint.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/bb64d4.pdfIn PDF document text
    • http://praktika-ingenieur.com/50348203743cds3a.pdfIn PDF document text
    • https://jifafaxima.weebly.com/uploads/1/3/1/8/131871415/pobojugod.pdfIn PDF document text
    • https://gununoneku.weebly.com/uploads/1/3/4/3/134309052/zixak.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/fofipevopej_vedulimiwudep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462059/normal_5fed600cd85ee.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/bevekizadoxuj/viveximawoxegaliji.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_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 6732 bytes
SHA-256: d9df67ed28c0754e70801a15654b9b693ce3c65b2c23f15b7e136c0afc8a391e
font_01_sfnt_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 5340 bytes
SHA-256: d7d59b24af87a430d73a83f21dfbe557efe35482ed8d43b6b1476694cf8317e9
font_02_sfnt_off000128c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C4 10460 bytes
SHA-256: 14c2115c2952754a220ac814b0aa4fe8b63919913d15377c0cfa1f29ae008531

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