Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8c245abe562629…

MALICIOUS

PDF

67.6 KB Created: 2020-12-18 20:22:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 47edadd1bfc9c8aa1a5b249dfed13d9d SHA-1: 105d85610393b30c7a49617aefa20e699072a049 SHA-256: 4d8c245abe562629219207260da409c81b34167d45de7c8722c9610247b0c886
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a school supply list, suggesting a lure. The presence of numerous external PDF links, many pointing to S3 buckets and other cloud storage, indicates an attempt to create a link farm or distribute further content. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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/strik?utm_term=ridge+elementary+school+supply+list In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5fb01bd1bb0a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5f88278c3e017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5fa4205b3e932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469863/normal_5fa9d23f05cba.pdfIn PDF document text
    • https://depemazijibibo.weebly.com/uploads/1/3/4/8/134846300/b5ba75a89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409254/normal_5f9680c96fcc9.pdfIn PDF document text
    • https://sibemawiwojaro.weebly.com/uploads/1/3/4/8/134887292/1150613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5f9785134de27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_5faa0906111cb.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/salade/87285139903.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cce660f2895dc1e7592c/t/5fc10b6a4f98375720049a35/1606486890405/kewawobifikododuzug.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/63046027972.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/ieee_829_template.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/gixonumakume.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_off0000c9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 5596 bytes
SHA-256: c6d731c43d5645473d261d1f653e81a0cd3bce3f2f859debdf58c0bf2bf101f8
font_01_sfnt_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 10856 bytes
SHA-256: 37c5a40f9267d51ab5496f5a58c27948551c288a962ee3e689d867bc96425fbe

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