Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd86a96124f939ad…

MALICIOUS

PDF

33.6 KB Created: 2020-03-28 04:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: de81118d42e6d70f8e2a31f215006cc1 SHA-1: daa401b9e80fbd662966b55e49e614730bb09bb9 SHA-256: fd86a96124f939ad362340e88fea0745dc9fd27d95f85f4e6b3270f6931accb6
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The presence of numerous numeric and slug-based URLs suggests an attempt to generate a large volume of content for search engines, potentially to mask malicious activity or distribute further malware.

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://growfoodnotdebt.com/uploads/1/3/1/4/131437846/131437846.html#ap+calculus+ab+2017+free+response+form+b
    • http://secure.aaoc.com/uploads/1/3/1/0/131070619/79555da.pdf
    • http://heatherplumridge.com/uploads/1/3/0/7/130740464/sivizumijemu-rolalamebitune-tupikulazipigiv-farusumezitevex.pdf
    • http://www.phenomvending.com/uploads/1/3/0/5/130589315/50ff4.pdf
    • http://microbiologynutsandbolts.com/uploads/1/3/0/3/130323488/5591c26cb8b.pdf
    • http://bestwholesale9.com/uploads/1/3/0/6/130639701/8898995.pdf
    • http://celebrateinvitations-test.com/uploads/1/3/0/5/130544754/649a2f4d3.pdf
    • http://creeaski.com/uploads/1/3/1/0/131070398/7007691.pdf
    • http://thejesusmission.com/uploads/1/3/0/6/130639136/sotifovezat.pdf
    • http://healingisnow.org/uploads/1/3/0/4/130489564/nepupenirapupelereza.pdf
    • http://ajealousgod.com/uploads/1/3/0/6/130639590/93fe5.pdf
    • http://www.pearinvestment.com/uploads/1/3/0/4/130476499/1496906.pdf
    • http://mastercleaneresteticaautomotiva.com/uploads/1/3/0/8/130813269/nojerowubexizipevugu.pdf
    • http://palosverdesplumber.net/uploads/1/3/0/8/130813635/8586615.pdf
    • http://www.annisepe.com/uploads/1/3/0/4/130435813/d0dbd6a1.pdf
    • http://www.bigtidesurfing.ca/uploads/1/3/0/6/130639777/favazorizewutu-bofujoponam.pdf
    • http://theyretheretheir.com/uploads/1/3/0/5/130550711/9325005.pdf
    • http://www.thesagaciousone.com/uploads/1/3/0/7/130775263/pujilumun_bovutef_toloreligalefa.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c78.bin
e34f4ed001624ea3b0f23219e84d0d0fc3554ca254a678922881352248ff2568
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C78 7308 bytes