Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d22ac0f6b20eb3…

MALICIOUS

PDF

89.8 KB Created: 2020-12-21 23:19:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cc81fea0fc7752e0669f7dcc857ecd6a SHA-1: 9304f5deee9d7fd5c7d39696bfd3e3083b98af6c SHA-256: c7d22ac0f6b20eb37e5c75e4556408648ffc1803d687e343bf25a41be908c84b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffmen.ru/aws?utm_term=huawei+mate+20+review+android+authority In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460983/normal_5fb32cb4641ed.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/tefukumibo.pdfIn PDF document text
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/xomojokowedojut.pdfIn PDF document text
    • https://liwobolavus.weebly.com/uploads/1/3/4/1/134131542/902eea104d33c.pdfIn PDF document text
    • https://nefavegipu.weebly.com/uploads/1/3/4/3/134365482/ec215850f5.pdfIn PDF document text
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/2545459.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/lajajol_janukimalumuj_rawezuzatiked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449987/normal_5f9fd84253746.pdfIn PDF document text
    • https://topekaje.weebly.com/uploads/1/3/4/1/134109010/1846730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f9e1bb51ab5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5f988d6f58d3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf4e2d334513fae414d40/1606218978620/gixezumikidifajefusub.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4ed69e2fce462bca5ae1b/t/5fc9bbbb55485c3109b04333/1607056316268/reminder_todo_list_habits.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_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 5344 bytes
SHA-256: 641124f1930186f9a0d37204b6209cc5230646b9af642a8a70b5a4a3257232ac
font_01_sfnt_off00013282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13282 11648 bytes
SHA-256: 4d0f4cda3beb791681063e3d625cb1dd74ab6247b8d397cd1bd72122bc99c2c6

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