Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84e856a1668e4df…

MALICIOUS

PDF

69.9 KB Created: 2020-12-24 13:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4215a428695eab27a68f8fea7db867c2 SHA-1: 1f72af9bf7afd4730e46d9c9cbf3ffd831e7e8fc SHA-256: a84e856a1668e4df9fe685e724f9541571564aeb627a305726f81e1bf06050cd
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 links, many of which point to redirector infrastructure, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The presence of numerous external links and the ML classifier's high confidence score support this assessment.

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://ggtraff.ru/aws?utm_term=adding+and+subtracting+integers+worksheets+grade+7 In PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/nixomaz_gagaxe_xafelujevonof_woluwapomewema.pdfIn PDF document text
    • https://timelasabo.weebly.com/uploads/1/3/4/3/134345700/9442034.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/eXKShiB/cartoon_cat_call_gif.pdfIn PDF document text
    • https://deximuxinudob.weebly.com/uploads/1/3/0/7/130739142/ed0e9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5fb728513fb19.pdfIn PDF document text
    • https://lukibufipijuzom.weebly.com/uploads/1/3/3/9/133997252/dabobe-nitefow-kadovuwebotamow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_5fb723fa35234.pdfIn PDF document text
    • https://cdn.sqhk.co/palazawu/chdjamf/48098549887.pdfIn PDF document text
    • https://lanudoda.weebly.com/uploads/1/3/2/3/132303217/b0e795e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5fe3df25047cb.pdfIn PDF document text
    • https://jegivobepumo.weebly.com/uploads/1/3/4/4/134444156/6125074.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/megelugik/requirements_elicitation_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/powerpoint_presentation_on_environmental_pollution.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/femewaboragivovavegitibob.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EF 5532 bytes
SHA-256: cb5c36fcb17a29d3645509af7ae9e4cae7969d6d201199d686ef7741b0b61763
font_01_sfnt_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 10880 bytes
SHA-256: 3c03ff83ef3d1a0bd2c6f8c71f936a9efcbe972673c87e614b2bfab536754117

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