Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd6adb7caf5e9a6…

MALICIOUS

PDF

72.1 KB Created: 2021-01-22 12:19:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0195620a46316f7be65c7a6baf760c7d SHA-1: e5a4d4304fbe42f0896cfba15fde32cea4de5a93 SHA-256: fdd6adb7caf5e9a6bda2733fb242c81787136029c8cdda001142cb4616b07347
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to external PDF files hosted on disposable or suspicious domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content, potentially via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/123?utm_term=find+the+message+math+worksheet In PDF document text
    • https://gezedasi.weebly.com/uploads/1/3/1/3/131378850/31e59e.pdfIn PDF document text
    • https://xokefinodoju.weebly.com/uploads/1/3/5/3/135316617/palapof.pdfIn PDF document text
    • https://cdn.sqhk.co/vexorikodo/fig110W/58358702320.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/3giijNb/7898666404.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/ehjhcfo/miromar_outlets_coupons.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375350/normal_5fff26a8d93ab.pdfIn PDF document text
    • https://site-1175602.mozfiles.com/files/1175602/scent_of_a_woman_quotes_hooah.pdfIn PDF document text
    • http://ketorebagibof.22web.org/11x17_booklet_template_indesign.pdfIn PDF document text
    • https://wanezevidika.weebly.com/uploads/1/3/4/5/134588498/9225320.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/5rggMje/46461792563.pdfIn PDF document text
    • https://site-1172154.mozfiles.com/files/1172154/72772426901.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/s6QPAgi/app_duplicator_64bit_supported.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zedotedifajo.epizy.com/11360170707.pdfIn PDF document text
    • http://topadut.epizy.com/95181950341.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/74340774868.pdfIn PDF document text
    • http://bitinorakinin.epizy.com/football_cup_2019_game_apk.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_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 5316 bytes
SHA-256: bc070352461816ec674673db4c4a6c53554966e0ea810d1346b841084ff2cc81
font_01_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 10640 bytes
SHA-256: 2acd44bbf53a1572b8535430b9755028abfda433bc1a58c44b706a99454d7100

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