Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a57188db1bd4dd1…

MALICIOUS

PDF

48.5 KB Created: 2020-05-21 08:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab0b5d387bfc1f15135ac8bca82b1b1f SHA-1: 68a90042d7fccee29e604ed1c7e8297ae37462f4 SHA-256: 7a57188db1bd4dd1c1da2677c2db0857b99c4019d400b04f24222d7f61dc3c32
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a tactic to manipulate search engine results or redirect users to malicious content. While no scripts were directly extracted, the PDF structure and the ML classifier strongly indicate malicious intent. The primary goal appears to be driving traffic to numerous external sites, likely for SEO poisoning or to serve further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://royquader.com/uploads/1/3/0/2/130289495/130289495.html#zolo+liberty+review
    • http://bunsngunsfitness.com/uploads/1/3/0/7/130739560/solokanora_kefoxejor.pdf
    • http://electricianservicesllc.net/uploads/1/3/0/7/130738914/6618522.pdf
    • http://laugh4earth.com/uploads/1/3/0/6/130639524/xedig.pdf
    • http://employeeadvocatecenter.com/uploads/1/3/1/3/131383737/fb4da289c8fa0.pdf
    • http://evergreencohoskprvpark.com/uploads/1/3/1/4/131438405/1802623.pdf
    • http://picaresquepress.com/uploads/1/3/1/1/131164558/woxurajilawizov.pdf
    • http://supernovaexotics.com/uploads/1/3/0/8/130814085/xisudugov.pdf
    • http://margowalsh.com/uploads/1/3/0/5/130546237/0b9f52c7689bf.pdf
    • http://silvaentertainment.net/uploads/1/3/1/4/131438453/dikodomabin_zatukuleb.pdf
    • http://nw-churchofchrist.com/uploads/1/3/0/6/130620848/bovilofunozob-nifagisazul-nupafezotozajo-jijijazikobereb.pdf
    • http://cdfigrant.com/uploads/1/3/1/0/131071286/befetatafo_wodiviruramol.pdf
    • http://alyssaclements.com/uploads/1/3/1/6/131606025/4910544.pdf
    • http://tiffinsfromhome.com/uploads/1/3/0/5/130589057/0d93c27420dae8f.pdf
    • http://annaaufseeser.com/uploads/1/3/0/6/130605390/f70cc73823e8.pdf
    • http://theroyaltywrx.com/uploads/1/3/0/4/130478314/wipefe.pdf
    • http://gatewayhobbies.com/uploads/1/3/0/7/130776033/ruduva_takobixozajeroz_rituweka.pdf
    • http://anisahjabar.com/uploads/1/3/0/9/130969644/potikevoredid_kumivigejikosa_moxuvuwogekex.pdf
    • http://partyperfect.org/uploads/1/3/1/3/131398099/7b5aa78d.pdf
    • http://rampartrenovation.com/uploads/1/3/0/9/130969218/pebetepase.pdf
    • http://vote727.org/uploads/1/3/0/8/130874049/0ef4f3cdb99c.pdf
    • http://goodfriedlawgroup.com/uploads/1/3/1/3/131398429/luxejuwolil_xabad_burugibe.pdf
    • http://altitudehomesllc.com/uploads/1/3/0/6/130604187/zisolopezuzanijuvaze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008384.bin
bd5462e2db1e12f45e79a1dd8e455159f65f1b27eb537e70e4dc01eeb819e7cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8384 21904 bytes

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