Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a0d8c43e31d379…

MALICIOUS

PDF

35.6 KB Created: 2020-03-14 19:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 35b2703e46263844e6bb3f8d18c0664a SHA-1: a68ddc514e90c15c112cf3c3d2789ac2de252309 SHA-256: 13a0d8c43e31d3790939170bc8f26a8ff880537be53da915c5bae6f34ef7f5dd
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as a lure or a distribution point for further payloads.

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://douniuniuwanfa.br3h.com/uploads/1/3/0/5/130542982/130542982.html#bohemian+rhapsody+piano+sheet+music+intro
    • http://www.hshlapparel.com/uploads/1/3/0/7/130740351/denadunexo.pdf
    • http://glasshousecafemq.com/uploads/1/3/0/6/130604616/bubumerizuxavuvete.pdf
    • http://74-123-78-79.mgwnet.com/uploads/1/3/0/7/130775192/radopaliwiduduwidid.pdf
    • http://huronvillas.com/uploads/1/3/0/4/130488470/vemaremowi.pdf
    • http://stevejamesconsulting.com/uploads/1/3/0/8/130874253/7087128.pdf
    • http://cleanallpm.ca/uploads/1/3/0/6/130639203/2ab3d4.pdf
    • http://blackfishmanresa.com/uploads/1/3/0/2/130287407/vukevikomuviguv.pdf
    • http://osievents.com/uploads/1/3/0/4/130493037/1941139.pdf
    • http://glynisfullwood.com/uploads/1/3/0/5/130551253/woviv.pdf
    • http://matio3d.com/uploads/1/3/0/4/130489025/zolavimox-numuwa-mogobumef.pdf
    • http://mta-sts.mx.lifefoursquare.com/uploads/1/3/0/7/130738913/4b76df48b74acb.pdf
    • http://adobeforfashion.net/uploads/1/3/0/6/130639444/95091e6471da1b.pdf
    • http://mail.pilgrimadventures.com/uploads/1/3/0/5/130551251/727bbc9989473.pdf
    • http://mta-sts.mail.bobgirling.com/uploads/1/3/0/4/130435893/rulobamofawowajoj.pdf
    • http://sdhlawoffices.com/uploads/1/3/0/4/130493143/2159484.pdf
    • http://hostmaster.restallsviolins.com/uploads/1/3/0/6/130620801/4683b36cf2e3.pdf
    • http://mylevelbest.org/uploads/1/3/0/5/130588729/fivulubabiguwot-xibotoseneronaw.pdf
    • http://cpanel.hgccz.com/uploads/1/3/0/6/130639698/8de2b101a3978e4.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_off000061dd.bin
0cc14f268738ef0f1845e09df440f9a2fb0df5b6d88cea8213a8fa228b9f4c3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x61DD 7944 bytes