Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a013e5be35acdd3…

MALICIOUS

PDF

42.2 KB Created: 2020-11-07 01:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ef60739b29e90cb7644f174ec648c99d SHA-1: 20bdf0ab522fa29378ec34b73c65fff5abf4fa96 SHA-256: 6a013e5be35acdd3a5868d486550ff5a42eb8432a716036d2c53500db15cffb2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?keyword=alice+parker+born PDF link annotation
    • https://matubupediguja.weebly.com/uploads/1/3/4/1/134131452/2369775.pdfIn PDF document text
    • https://gupasozulo.weebly.com/uploads/1/3/4/4/134471060/bitonuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3673b3c4-7960-41c9-b77a-247fd7799990/94758813990.pdfIn PDF document text
    • https://zefepured.files.wordpress.com/2020/11/the_wonder_weeks_milestone_guide.pdfIn PDF document text
    • https://jominetiku.files.wordpress.com/2020/11/map_of_europe_before_ww1_and_after_w.pdfIn PDF document text
    • https://fefitaw.files.wordpress.com/2020/11/64939725781.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/16473208510.pdfIn PDF document text
    • https://wezodik.files.wordpress.com/2020/11/59584403987.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://vukewakir.files.wordpress.com/2020/11/89304298430.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/cbse_class_12_accountancy_question_paper_2016.pdfIn PDF document text
    • https://tedujetij.files.wordpress.com/2020/11/rewazamuzaronazemozaf.pdfIn PDF document text
    • https://xixojis.files.wordpress.com/2020/11/pupelujoguwagelevakowofaf.pdfIn PDF document text
    • https://wixipozi.files.wordpress.com/2020/11/fenixaxowagodexomajul.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_off000067b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67B8 4940 bytes
SHA-256: 6dbe58f588612005de9d66144893ed8848dc6e9ed4f2f8e43e70bcece6638ea3
font_01_sfnt_off00007892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7892 10528 bytes
SHA-256: 2dd341932f25ce6a2410409c47ee6f11283867af92a35e4e10d11d382b7f4931

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