Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c57915665342bc…

MALICIOUS

PDF

71.9 KB Created: 2020-12-31 22:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7417cad2c41477093f0df480f13eed23 SHA-1: 3f2553dc5f5fa926629afd5bba7fd01d5baf470c SHA-256: 82c57915665342bc7cbd3f3781755ada05bf43d780a2300dce88d3f104000845
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan. The document body, though heavily obfuscated, contains text related to 'Interregional migration examples' and 'wkhtmltopdf', suggesting a lure to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffking.ru/123?utm_term=interregional+migration+examples PDF link annotation
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/wofexavosopuduputola.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460460/normal_5febe10f766f3.pdfIn PDF document text
    • https://fexegidonowagi.weebly.com/uploads/1/3/5/3/135325594/ruwamutademubapaten.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5fdfefd2e6618.pdfIn PDF document text
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/7d105673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372361/normal_5fe492c4d9d60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f9042d8ad583.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/lokijuronig/pejobapokidirowuxujagum.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/92989453276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12676af4-bb19-413a-9f2b-0923ffc4cb99/the_joker_full_free_movie_stream.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/zekuxunasikijorumaja.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/destiny_2_forsaken_missions_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/31386101576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76bfff05-fba2-4650-bb3a-80fd061e5c83/2013_amc_10b_cutoff.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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 5144 bytes
SHA-256: af5656085fcb2421f3ecf55e238b3b52182d7a7ee9e19927989afaefac2096ae
font_01_sfnt_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 10832 bytes
SHA-256: 8bcd032db292937a4f2c2e68fcc5cc334074077f1437f39215dd26287bdf27ea

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