Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cd44d3da45734a…

MALICIOUS

PDF

42.5 KB Created: 2020-04-03 06:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d2fc50a06e58a9c1daee2950350d160 SHA-1: a1bbc95c50dd1f2c16cdaa48c92fcb19686550ec SHA-256: 05cd44d3da45734a8ca4c4c69d2e30ad55c7caca99f1b45a10c57d6206ae54b0
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The embedded URLs point to various domains, many of which appear to be hosting PDF files with numeric or generic slugs, further supporting the link farm hypothesis. The ML classifier also strongly indicated maliciousness.

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://godblessmeghan.com/uploads/1/3/1/3/131380347/131380347.html#como+se+escribe+visit+en+pasado+participio
    • http://hostmaster.walkerlawofficepllc.com/uploads/1/3/0/6/130639136/galanafuxeputuwox.pdf
    • http://pcexposure.org/uploads/1/3/0/5/130539287/fibabudogeza.pdf
    • http://livingyourlegacy.net/uploads/1/3/1/3/131381679/dilisefowopis-firoxiseti-xekejusoma-gusadazuda.pdf
    • http://whitneywhitman.com/uploads/1/3/0/8/130874239/bafuxofamali.pdf
    • http://silvervigor.com/uploads/1/3/0/2/130272340/a1ce696c.pdf
    • http://jacquelinemiddleton.com/uploads/1/3/0/6/130621401/aea72be9.pdf
    • http://fairytalechildcare.com/uploads/1/3/0/5/130538836/4195948.pdf
    • http://kkmediation.com/uploads/1/3/0/6/130621780/dazipaduxakese.pdf
    • http://wzstudios.net/uploads/1/3/0/8/130874318/nowagibupaka_fewumejuti_sodafopugigim_kewin.pdf
    • http://myonepynt.com/uploads/1/3/0/5/130588653/pokux.pdf
    • http://imagery.solutions/uploads/1/3/1/0/131071188/04e55dac189f91.pdf
    • http://gmschoirs.com/uploads/1/3/0/9/130969917/8253119.pdf
    • http://dinnovation.net/uploads/1/3/0/6/130621865/xaxivevo.pdf
    • http://drgraefe.com/uploads/1/3/0/7/130776827/sumuniton.pdf
    • http://tuhoor.com/uploads/1/3/1/3/131379042/waxal.pdf
    • http://adventureinrealestate.com/uploads/1/3/0/6/130604417/jaliteri.pdf
    • http://deangreenmedia.com/uploads/1/3/1/0/131070866/dukobafusozo-sowigeril.pdf
    • http://mapletreemarketplace.com/uploads/1/3/0/6/130639946/b887f84a208291f.pdf
    • http://nzwildlifeartist.com/uploads/1/3/0/7/130776451/tovota-nukozi-kilepufalutaf.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067e2.bin
f6e906000c6dcfa51ff4e35347e0de4eadbab7b168cae344569af9e87691037f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E2 8244 bytes
font_01_sfnt_off000085a6.bin
a165db233a17ecd5b75d607947f61dfeffa9306d5297ff8339e29f7feb2b25ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A6 16416 bytes

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