Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a797eff1aba0b7b…

MALICIOUS

PDF

54.3 KB Created: 2020-03-15 08:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f20c9d24b0176ce837bf0432501de1e5 SHA-1: f9e7aa69b776fbfd4cda4f35716c851c022c87cc SHA-256: 4a797eff1aba0b7bff429e95f7a756f5b9b933ba2436da55fcc0d57c41977f85
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on various domains. This behavior is characteristic of SEO spam or phishing campaigns designed to drive traffic to numerous unrelated or malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://lamee-dark-version3-de.devsite-1.com/uploads/1/3/0/6/130604351/130604351.html#mariage+d%27+amour+pdf+guitar
    • http://mx.tokyogoannas.com/uploads/1/3/0/4/130483573/323b2e19.pdf
    • http://metroartdesign.com/uploads/1/3/0/7/130739470/didoz.pdf
    • http://musette-ventures.com/uploads/1/3/0/5/130550847/82e55038abd23d.pdf
    • http://theweddingcollective.com.au/uploads/1/3/0/4/130478261/6967342.pdf
    • http://thechristmind.net/uploads/1/3/0/7/130740617/bamazolifav.pdf
    • http://travelmarketingclientele.com/uploads/1/3/0/6/130639129/6876687.pdf
    • http://rochestersportsfan.com/uploads/1/3/0/2/130272644/sepusomawexet_fifoxokilurojew_benidavezaj.pdf
    • http://kasmimi.com/uploads/1/3/0/6/130620268/d1d04eec4e.pdf
    • http://taephotography.com/uploads/1/3/0/6/130639635/f601b5.pdf
    • http://mx.vernonyoga.com/uploads/1/3/0/3/130379239/gisimadidozowet.pdf
    • http://natureguidetrainingbotswana.com/uploads/1/3/0/4/130479435/7494751.pdf
    • http://escaperoomnewport.com/uploads/1/3/0/5/130551551/bapomuvepononuw-pefexalatud-munutokip-loxikalibano.pdf
    • http://mta-sts.jwmurphyguitars.com/uploads/1/3/0/6/130640119/tejapokemodapokuguzo.pdf
    • http://karmatypology.net/uploads/1/3/0/8/130814286/6261496.pdf
    • http://www.henrytyrrell.co.uk/uploads/1/3/0/7/130740189/2575580.pdf
    • http://regionc.swe.org/uploads/1/3/0/6/130605255/felalupuribis-rofenota-webodekinupekas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a48.bin
6770d5c6de5b77bdc761a0f5be849f11a0230a8db62ed0086c1747c30be20391
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A48 10228 bytes
font_01_sfnt_off00009ec3.bin
88999df94cfbfcde3460281d3113e7bbb271ac78058538a2351bb8b3233a40d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC3 6208 bytes
font_02_sfnt_off0000b2d2.bin
ab8c2b63570e405eb98bbf795cf8c58dc4093088a633ca10f2b33f77298f05a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D2 17996 bytes